55312515 has 24 divisors (see below), whose sum is σ = 100922640. Its totient is φ = 27946944.

The previous prime is 55312511. The next prime is 55312519. The reversal of 55312515 is 51521355.

It is an interprime number because it is at equal distance from previous prime (55312511) and next prime (55312519).

It is not a de Polignac number, because 55312515 - 2² = 55312511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55312511) 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, 31492 + ... + 33201.

It is an arithmetic number, because the mean of its divisors is an integer number (4205110).

Almost surely, 2^55312515 is an apocalyptic number.

55312515 is a deficient number, since it is larger than the sum of its proper divisors (45610125).

55312515 is a wasteful number, since it uses less digits than its factorization.

55312515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64723 (or 64720 counting only the distinct ones).

The product of its digits is 3750, while the sum is 27.

The square root of 55312515 is about 7437.2383987607. The cubic root of 55312515 is about 381.0141768342.

The spelling of 55312515 in words is "fifty-five million, three hundred twelve thousand, five hundred fifteen".