Number analysis
136
136 is a composite even number that factors as 2^3 × 17.
136 is a composite even number that factors as 2^3 × 17.
The number itself
- Value
- 136
- Digits
- 3
- Digit sum
- 10
- Reversed
- 631
- Palindrome
- No
1 + 3 + 6
Digit sum repeated until one digit remains; equals n mod 9 (with 9 for multiples of 9).
Reverses to 631.
Parity and primality
- Parity
- Even
- Prime
- No
- Prime factorisation
- 2^3 × 17
- Squarefree
- No
- Möbius μ(n)
- 0
- Nearest primes
- 131 ← → 137
Divisible by 2.
Composite — it factors as 2^3 × 17.
2 distinct prime factors, 4 with multiplicity.
At least one prime appears squared.
Zero, because a squared prime divides n.
A gap of 6 between them.
Divisors
- Aliquot sum
- 134
- Classification
- Deficient
1, 2, 4, 8, 17, 34, 68, 136
The proper divisors — everything except n itself.
Its proper divisors fall short by 2.
How many integers from 1 to n share no factor with n.
Sums and additive structure
- Sum of two squares
- Yes
- Sum of three squares
- Yes
- Sum of four squares
- Yes
- Goldbach pair
- 5 + 131
6² + 10² = 136
Legendre's three-square theorem allows it.
Lagrange's four-square theorem: every non-negative integer is, without exception.
The smallest pair of primes summing to n. Goldbach’s conjecture says one always exists; it remains unproven.
Shapes and sequences
- Triangular number
- Yes — the 16th
Digit curiosities
- Happy number
- No
- Harshad number
- No
- Collatz trajectory
- 15 steps to 1
Summing the squares of its digits falls into the 4 → 16 → 37 → … → 4 cycle.
Not divisible by its digit sum 10.
Peaks at 136 along the way.
Written other ways
- Binary
- 10001000
- Octal
- 210
- Hexadecimal
- 88
- Base 36
- 3S
- Roman numerals
- CXXXVI
- In words
- one hundred and thirty-six
- Scientific notation
- 1.36 × 10^2
Is 136 a prime number?
Composite — it factors as 2^3 × 17.
Nearby numbers
Other numeral systems
Beyond the bases and Roman numerals above, these notations write 136 their own way.
- Morse code
- · − − − − · · · − − − · · · ·
- Devanagari
- १३६
- Tamil
- ௱௩௰௬
- Thai
- ๑๓๖
References
Further reading: Wikipedia · Wikidata
Notations, naming and the links above come from Wikidata, whose structured data is dedicated to the public domain under CC0-1.0. Retrieved 2026-10-07.