55491571 has 12 divisors (see below), whose sum is σ = 61073320. Its totient is φ = 50276160.

The previous prime is 55491539. The next prime is 55491577. The reversal of 55491571 is 17519455.

It is not a de Polignac number, because 55491571 - 2⁵ = 55491539 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55491571.

It is not an unprimeable number, because it can be changed into a prime (55491577) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7291 + ... + 12811.

Almost surely, 2^55491571 is an apocalyptic number.

55491571 is a deficient number, since it is larger than the sum of its proper divisors (5581749).

55491571 is a wasteful number, since it uses less digits than its factorization.

55491571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5586 (or 5563 counting only the distinct ones).

The product of its digits is 31500, while the sum is 37.

The square root of 55491571 is about 7449.2664739557. The cubic root of 55491571 is about 381.4248698465.

The spelling of 55491571 in words is "fifty-five million, four hundred ninety-one thousand, five hundred seventy-one".