115631731 has 2 divisors, whose sum is σ = 115631732. Its totient is φ = 115631730.

The previous prime is 115631713. The next prime is 115631759. The reversal of 115631731 is 137136511.

Together with previous prime (115631713) it forms an Ormiston pair, because they use the same digits, order apart.

It is an a-pointer prime, because the next prime (115631759) can be obtained adding 115631731 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 115631731 - 2²⁵ = 82077299 is a prime.

It is a super-2 number, since 2×115631731² = 26741394428112722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 115631731.

It is not a weakly prime, because it can be changed into another prime (115631231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57815865 + 57815866.

It is an arithmetic number, because the mean of its divisors is an integer number (57815866).

Almost surely, 2^115631731 is an apocalyptic number.

115631731 is a deficient number, since it is larger than the sum of its proper divisors (1).

115631731 is an equidigital number, since it uses as much as digits as its factorization.

115631731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1890, while the sum is 28.

The square root of 115631731 is about 10753.2195643909. The cubic root of 115631731 is about 487.1832433640.

The spelling of 115631731 in words is "one hundred fifteen million, six hundred thirty-one thousand, seven hundred thirty-one".