55691187 has 4 divisors (see below), whose sum is σ = 74254920. Its totient is φ = 37127456.

The previous prime is 55691177. The next prime is 55691213. The reversal of 55691187 is 78119655.

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 55691187 - 2⁷ = 55691059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55691117) 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, 9281862 + ... + 9281867.

It is an arithmetic number, because the mean of its divisors is an integer number (18563730).

Almost surely, 2^55691187 is an apocalyptic number.

55691187 is a deficient number, since it is larger than the sum of its proper divisors (18563733).

55691187 is a wasteful number, since it uses less digits than its factorization.

55691187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18563732.

The product of its digits is 75600, while the sum is 42.

The square root of 55691187 is about 7462.6528125058. The cubic root of 55691187 is about 381.8816803226.

The spelling of 55691187 in words is "fifty-five million, six hundred ninety-one thousand, one hundred eighty-seven".