115631 has 2 divisors, whose sum is σ = 115632. Its totient is φ = 115630.

The previous prime is 115613. The next prime is 115637. The reversal of 115631 is 136511.

Together with previous prime (115613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (136511) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115631 is a prime.

It is a super-2 number, since 2×115631² = 26741056322, which contains 22 as substring.

It is a Chen prime.

It is equal to p₁₀₉₂₅ and since 115631 and 10925 have the same sum of digits, it is a Honaker prime.

It is a plaindrome in base 12.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 115631.

It is not a weakly prime, because it can be changed into another prime (115637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57815 + 57816.

It is an arithmetic number, because the mean of its divisors is an integer number (57816).

2¹¹⁵⁶³¹ is an apocalyptic number.

115631 is a deficient number, since it is larger than the sum of its proper divisors (1).

115631 is an equidigital number, since it uses as much as digits as its factorization.

115631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90, while the sum is 17.

The square root of 115631 is about 340.0455851794. The cubic root of 115631 is about 48.7182216738.

The spelling of 115631 in words is "one hundred fifteen thousand, six hundred thirty-one".