55331857 has 16 divisors (see below), whose sum is σ = 66774400. Its totient is φ = 44789760.

The previous prime is 55331851. The next prime is 55331873. The reversal of 55331857 is 75813355.

It is a cyclic number.

It is not a de Polignac number, because 55331857 - 2⁷ = 55331729 is a prime.

It is a super-2 number, since 2×55331857² = 6123228798136898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55331851) 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, 71569 + ... + 72337.

It is an arithmetic number, because the mean of its divisors is an integer number (4173400).

Almost surely, 2^55331857 is an apocalyptic number.

It is an amenable number.

55331857 is a deficient number, since it is larger than the sum of its proper divisors (11442543).

55331857 is a wasteful number, since it uses less digits than its factorization.

55331857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1336.

The product of its digits is 63000, while the sum is 37.

The square root of 55331857 is about 7438.5386333607. The cubic root of 55331857 is about 381.0585834051.

The spelling of 55331857 in words is "fifty-five million, three hundred thirty-one thousand, eight hundred fifty-seven".