55536891 has 4 divisors (see below), whose sum is σ = 74049192. Its totient is φ = 37024592.

The previous prime is 55536869. The next prime is 55536911. The reversal of 55536891 is 19863555.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55536891 - 2¹⁰ = 55535867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55536821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9256146 + ... + 9256151.

It is an arithmetic number, because the mean of its divisors is an integer number (18512298).

Almost surely, 2^55536891 is an apocalyptic number.

55536891 is a deficient number, since it is larger than the sum of its proper divisors (18512301).

55536891 is a wasteful number, since it uses less digits than its factorization.

55536891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18512300.

The product of its digits is 162000, while the sum is 42.

The square root of 55536891 is about 7452.3077633710. The cubic root of 55536891 is about 381.5286782331.

The spelling of 55536891 in words is "fifty-five million, five hundred thirty-six thousand, eight hundred ninety-one".