55981171 has 4 divisors (see below), whose sum is σ = 55998072. Its totient is φ = 55964272.

The previous prime is 55981109. The next prime is 55981193. The reversal of 55981171 is 17118955.

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 55981171 - 2¹¹ = 55979123 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 55981171.

It is not an unprimeable number, because it can be changed into a prime (55988171) 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, 1666 + ... + 10711.

It is an arithmetic number, because the mean of its divisors is an integer number (13999518).

Almost surely, 2^55981171 is an apocalyptic number.

55981171 is a deficient number, since it is larger than the sum of its proper divisors (16901).

55981171 is a wasteful number, since it uses less digits than its factorization.

55981171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16900.

The product of its digits is 12600, while the sum is 37.

The square root of 55981171 is about 7482.0566022986. The cubic root of 55981171 is about 382.5433524844.

The spelling of 55981171 in words is "fifty-five million, nine hundred eighty-one thousand, one hundred seventy-one".