55712591 has 4 divisors (see below), whose sum is σ = 60777384. Its totient is φ = 50647800.

The previous prime is 55712561. The next prime is 55712627. The reversal of 55712591 is 19521755.

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 55712591 - 2²² = 51518287 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 (55712551) 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, 2532380 + ... + 2532401.

It is an arithmetic number, because the mean of its divisors is an integer number (15194346).

Almost surely, 2^55712591 is an apocalyptic number.

55712591 is a deficient number, since it is larger than the sum of its proper divisors (5064793).

55712591 is a wasteful number, since it uses less digits than its factorization.

55712591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5064792.

The product of its digits is 15750, while the sum is 35.

The square root of 55712591 is about 7464.0867492279. The cubic root of 55712591 is about 381.9305973894.

The spelling of 55712591 in words is "fifty-five million, seven hundred twelve thousand, five hundred ninety-one".