136531 has 2 divisors, whose sum is σ = 136532. Its totient is φ = 136530.

The previous prime is 136523. The next prime is 136537. The reversal of 136531 is 135631.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 136531 - 2³ = 136523 is a prime.

It is a super-2 number, since 2×136531² = 37281427922, which contains 22 as substring.

It is the 370-th Hogben number.

It is equal to p₁₂₇₁₈ and since 136531 and 12718 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 136499 and 136508.

It is not a weakly prime, because it can be changed into another prime (136537) by changing a digit.

It is a nontrivial repunit in base 369.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68265 + 68266.

It is an arithmetic number, because the mean of its divisors is an integer number (68266).

2¹³⁶⁵³¹ is an apocalyptic number.

136531 is a deficient number, since it is larger than the sum of its proper divisors (1).

136531 is an equidigital number, since it uses as much as digits as its factorization.

136531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 270, while the sum is 19.

The square root of 136531 is about 369.5010148836. The cubic root of 136531 is about 51.4924738428.

Subtracting from 136531 its reverse (135631), we obtain a square (900 = 30²).

The spelling of 136531 in words is "one hundred thirty-six thousand, five hundred thirty-one".