115513531 has 6 divisors (see below), whose sum is σ = 134372940. Its totient is φ = 99011556.

The previous prime is 115513501. The next prime is 115513537. The reversal of 115513531 is 135315511.

It is a happy number.

It is not a de Polignac number, because 115513531 - 2¹¹ = 115511483 is a prime.

It is a super-2 number, since 2×115513531² = 26686751688175922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 115513496 and 115513505.

It is not an unprimeable number, because it can be changed into a prime (115513537) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1178661 + ... + 1178758.

It is an arithmetic number, because the mean of its divisors is an integer number (22395490).

Almost surely, 2^115513531 is an apocalyptic number.

115513531 is a deficient number, since it is larger than the sum of its proper divisors (18859409).

115513531 is an equidigital number, since it uses as much as digits as its factorization.

115513531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2357433 (or 2357426 counting only the distinct ones).

The product of its digits is 1125, while the sum is 25.

The square root of 115513531 is about 10747.7221307587. The cubic root of 115513531 is about 487.0171854507.

The spelling of 115513531 in words is "one hundred fifteen million, five hundred thirteen thousand, five hundred thirty-one".