115609531 has 2 divisors, whose sum is σ = 115609532. Its totient is φ = 115609530.

The previous prime is 115609517. The next prime is 115609553. The reversal of 115609531 is 135906511.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 115609531 - 2⁹ = 115609019 is a prime.

It is a super-2 number, since 2×115609531² = 26731127316079922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 115609493 and 115609502.

It is not a weakly prime, because it can be changed into another prime (115609831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57804765 + 57804766.

It is an arithmetic number, because the mean of its divisors is an integer number (57804766).

Almost surely, 2^115609531 is an apocalyptic number.

115609531 is a deficient number, since it is larger than the sum of its proper divisors (1).

115609531 is an equidigital number, since it uses as much as digits as its factorization.

115609531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4050, while the sum is 31.

The square root of 115609531 is about 10752.1872658543. The cubic root of 115609531 is about 487.1520634559.

The spelling of 115609531 in words is "one hundred fifteen million, six hundred nine thousand, five hundred thirty-one".