55491915 has 16 divisors (see below), whose sum is σ = 88911648. Its totient is φ = 29554176.

The previous prime is 55491911. The next prime is 55491923. The reversal of 55491915 is 51919455.

It is not a de Polignac number, because 55491915 - 2² = 55491911 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55491911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10627 + ... + 14963.

It is an arithmetic number, because the mean of its divisors is an integer number (5556978).

Almost surely, 2^55491915 is an apocalyptic number.

55491915 is a deficient number, since it is larger than the sum of its proper divisors (33419733).

55491915 is a wasteful number, since it uses less digits than its factorization.

55491915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5198.

The product of its digits is 40500, while the sum is 39.

The square root of 55491915 is about 7449.2895634416. The cubic root of 55491915 is about 381.4256580135.

The spelling of 55491915 in words is "fifty-five million, four hundred ninety-one thousand, nine hundred fifteen".