115501531 has 4 divisors (see below), whose sum is σ = 118623232. Its totient is φ = 112379832.

The previous prime is 115501433. The next prime is 115501541. The reversal of 115501531 is 135105511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115501531 is a prime.

It is a super-2 number, since 2×115501531² = 26681207326687922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115501541) 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, 1560795 + ... + 1560868.

It is an arithmetic number, because the mean of its divisors is an integer number (29655808).

Almost surely, 2^115501531 is an apocalyptic number.

115501531 is a deficient number, since it is larger than the sum of its proper divisors (3121701).

115501531 is an equidigital number, since it uses as much as digits as its factorization.

115501531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3121700.

The product of its (nonzero) digits is 375, while the sum is 22.

The square root of 115501531 is about 10747.1638584326. The cubic root of 115501531 is about 487.0003204464. Note that the first 3 decimals are identical.

The spelling of 115501531 in words is "one hundred fifteen million, five hundred one thousand, five hundred thirty-one".