55500291 has 72 divisors (see below), whose sum is σ = 107877744. Its totient is φ = 27095040.

The previous prime is 55500283. The next prime is 55500299. The reversal of 55500291 is 19200555.

It is an interprime number because it is at equal distance from previous prime (55500283) and next prime (55500299).

It is not a de Polignac number, because 55500291 - 2³ = 55500283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55500299) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 82131 + ... + 82803.

It is an arithmetic number, because the mean of its divisors is an integer number (1498302).

Almost surely, 2^55500291 is an apocalyptic number.

55500291 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

55500291 is a deficient number, since it is larger than the sum of its proper divisors (52377453).

55500291 is a wasteful number, since it uses less digits than its factorization.

55500291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721 (or 711 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 27.

The square root of 55500291 is about 7449.8517434913. The cubic root of 55500291 is about 381.4448479597. Note that the first 3 decimals are identical.

The spelling of 55500291 in words is "fifty-five million, five hundred thousand, two hundred ninety-one".