55172571 has 4 divisors (see below), whose sum is σ = 73563432. Its totient is φ = 36781712.

The previous prime is 55172567. The next prime is 55172651. The reversal of 55172571 is 17527155.

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 55172571 - 2² = 55172567 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55172071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9195426 + ... + 9195431.

It is an arithmetic number, because the mean of its divisors is an integer number (18390858).

Almost surely, 2^55172571 is an apocalyptic number.

55172571 is a deficient number, since it is larger than the sum of its proper divisors (18390861).

55172571 is a wasteful number, since it uses less digits than its factorization.

55172571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18390860.

The product of its digits is 12250, while the sum is 33.

The square root of 55172571 is about 7427.8241093876. The cubic root of 55172571 is about 380.6925758401.

The spelling of 55172571 in words is "fifty-five million, one hundred seventy-two thousand, five hundred seventy-one".