56216181 has 24 divisors (see below), whose sum is σ = 90205920. Its totient is φ = 31013472.

The previous prime is 56216159. The next prime is 56216189. The reversal of 56216181 is 18161265.

It is not a de Polignac number, because 56216181 - 2¹¹ = 56214133 is a prime.

It is a super-2 number, since 2×56216181² = 6320518012449522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56216189) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2331 + ... + 10856.

It is an arithmetic number, because the mean of its divisors is an integer number (3758580).

Almost surely, 2^56216181 is an apocalyptic number.

It is an amenable number.

56216181 is a deficient number, since it is larger than the sum of its proper divisors (33989739).

56216181 is a wasteful number, since it uses less digits than its factorization.

56216181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13233 (or 13226 counting only the distinct ones).

The product of its digits is 2880, while the sum is 30.

The square root of 56216181 is about 7497.7450610167. The cubic root of 56216181 is about 383.0779131918.

The spelling of 56216181 in words is "fifty-six million, two hundred sixteen thousand, one hundred eighty-one".