115561515 has 24 divisors (see below), whose sum is σ = 195151248. Its totient is φ = 58386240.

The previous prime is 115561513. The next prime is 115561541. The reversal of 115561515 is 515165511.

It is not a de Polignac number, because 115561515 - 2¹ = 115561513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (115561513) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5256 + ... + 16085.

It is an arithmetic number, because the mean of its divisors is an integer number (8131302).

Almost surely, 2^115561515 is an apocalyptic number.

115561515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

115561515 is a deficient number, since it is larger than the sum of its proper divisors (79589733).

115561515 is a wasteful number, since it uses less digits than its factorization.

115561515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21387 (or 21368 counting only the distinct ones).

The product of its digits is 3750, while the sum is 30.

The square root of 115561515 is about 10749.9541859489. The cubic root of 115561515 is about 487.0846113109.

The spelling of 115561515 in words is "one hundred fifteen million, five hundred sixty-one thousand, five hundred fifteen".