55471691 has 4 divisors (see below), whose sum is σ = 60514584. Its totient is φ = 50428800.

The previous prime is 55471687. The next prime is 55471709. The reversal of 55471691 is 19617455.

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 55471691 - 2² = 55471687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55471291) 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, 2521430 + ... + 2521451.

It is an arithmetic number, because the mean of its divisors is an integer number (15128646).

Almost surely, 2^55471691 is an apocalyptic number.

55471691 is a deficient number, since it is larger than the sum of its proper divisors (5042893).

55471691 is a wasteful number, since it uses less digits than its factorization.

55471691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5042892.

The product of its digits is 37800, while the sum is 38.

The square root of 55471691 is about 7447.9319948560. The cubic root of 55471691 is about 381.3793155880.

The spelling of 55471691 in words is "fifty-five million, four hundred seventy-one thousand, six hundred ninety-one".