55918087 has 4 divisors (see below), whose sum is σ = 55965400. Its totient is φ = 55870776.

The previous prime is 55918081. The next prime is 55918099. The reversal of 55918087 is 78081955.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55918087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55918081) 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, 21837 + ... + 24262.

It is an arithmetic number, because the mean of its divisors is an integer number (13991350).

Almost surely, 2^55918087 is an apocalyptic number.

55918087 is a deficient number, since it is larger than the sum of its proper divisors (47313).

55918087 is a wasteful number, since it uses less digits than its factorization.

55918087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47312.

The product of its (nonzero) digits is 100800, while the sum is 43.

The square root of 55918087 is about 7477.8397281568. The cubic root of 55918087 is about 382.3996051324.

The spelling of 55918087 in words is "fifty-five million, nine hundred eighteen thousand, eighty-seven".