56556181 has 16 divisors (see below), whose sum is σ = 63544320. Its totient is φ = 49895280.

The previous prime is 56556169. The next prime is 56556187. The reversal of 56556181 is 18165565.

It is a cyclic number.

It is not a de Polignac number, because 56556181 - 2⁹ = 56555669 is a prime.

It is a super-2 number, since 2×56556181² = 6397203218609522, which contains 22 as substring.

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 56556181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56556187) 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 15 ways as a sum of consecutive naturals, for example, 71470 + ... + 72256.

It is an arithmetic number, because the mean of its divisors is an integer number (3971520).

Almost surely, 2^56556181 is an apocalyptic number.

It is an amenable number.

56556181 is a deficient number, since it is larger than the sum of its proper divisors (6988139).

56556181 is a wasteful number, since it uses less digits than its factorization.

56556181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 984.

The product of its digits is 36000, while the sum is 37.

The square root of 56556181 is about 7520.3843651771. The cubic root of 56556181 is about 383.8486568133.

The spelling of 56556181 in words is "fifty-six million, five hundred fifty-six thousand, one hundred eighty-one".