55981156 has 24 divisors (see below), whose sum is σ = 122141376. Its totient is φ = 21810720.

The previous prime is 55981109. The next prime is 55981193. The reversal of 55981156 is 65118955.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90571 + ... + 91186.

It is an arithmetic number, because the mean of its divisors is an integer number (5089224).

Almost surely, 2^55981156 is an apocalyptic number.

It is an amenable number.

55981156 is an abundant number, since it is smaller than the sum of its proper divisors (66160220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55981156 is a wasteful number, since it uses less digits than its factorization.

55981156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181779 (or 181777 counting only the distinct ones).

The product of its digits is 54000, while the sum is 40.

The square root of 55981156 is about 7482.0555999003. The cubic root of 55981156 is about 382.5433183173.

The spelling of 55981156 in words is "fifty-five million, nine hundred eighty-one thousand, one hundred fifty-six".