115711831 has 4 divisors (see below), whose sum is σ = 115792600. Its totient is φ = 115631064.

The previous prime is 115711829. The next prime is 115711861. The reversal of 115711831 is 138117511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 138117511 = 7 ⋅19731073.

It is a cyclic number.

It is not a de Polignac number, because 115711831 - 2¹ = 115711829 is a prime.

It is a super-2 number, since 2×115711831² = 26778455666745122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 115711831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115711861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38196 + ... + 41113.

It is an arithmetic number, because the mean of its divisors is an integer number (28948150).

Almost surely, 2^115711831 is an apocalyptic number.

115711831 is a deficient number, since it is larger than the sum of its proper divisors (80769).

115711831 is an equidigital number, since it uses as much as digits as its factorization.

115711831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80768.

The product of its digits is 840, while the sum is 28.

The square root of 115711831 is about 10756.9433855534. The cubic root of 115711831 is about 487.2957106779.

The spelling of 115711831 in words is "one hundred fifteen million, seven hundred eleven thousand, eight hundred thirty-one".