115531515 has 40 divisors (see below), whose sum is σ = 225937008. Its totient is φ = 56013120.

The previous prime is 115531511. The next prime is 115531543. The reversal of 115531515 is 515135511.

115531515 is a `hidden beast` number, since 115 + 5 + 31 + 515 = 666.

It is not a de Polignac number, because 115531515 - 2² = 115531511 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (115531511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 8512 + ... + 17421.

Almost surely, 2^115531515 is an apocalyptic number.

115531515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

115531515 is a deficient number, since it is larger than the sum of its proper divisors (110405493).

115531515 is a wasteful number, since it uses less digits than its factorization.

115531515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25961 (or 25952 counting only the distinct ones).

The product of its digits is 1875, while the sum is 27.

The square root of 115531515 is about 10748.5587405940. The cubic root of 115531515 is about 487.0424582839.

The spelling of 115531515 in words is "one hundred fifteen million, five hundred thirty-one thousand, five hundred fifteen".