55321515 has 32 divisors (see below), whose sum is σ = 101529600. Its totient is φ = 28550880.

The previous prime is 55321501. The next prime is 55321529. The reversal of 55321515 is 51512355.

55321515 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (55321501) and next prime (55321529).

It is not a de Polignac number, because 55321515 - 2⁴ = 55321499 is a prime.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2425 + ... + 10794.

It is an arithmetic number, because the mean of its divisors is an integer number (3172800).

Almost surely, 2^55321515 is an apocalyptic number.

55321515 is a deficient number, since it is larger than the sum of its proper divisors (46208085).

55321515 is a wasteful number, since it uses less digits than its factorization.

55321515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13264 (or 13258 counting only the distinct ones).

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

The square root of 55321515 is about 7437.8434374488. The cubic root of 55321515 is about 381.0348408835.

The spelling of 55321515 in words is "fifty-five million, three hundred twenty-one thousand, five hundred fifteen".