56181861 has 12 divisors (see below), whose sum is σ = 81221088. Its totient is φ = 37422504.

The previous prime is 56181859. The next prime is 56181863. The reversal of 56181861 is 16818165.

It is an interprime number because it is at equal distance from previous prime (56181859) and next prime (56181863).

It is not a de Polignac number, because 56181861 - 2¹ = 56181859 is a prime.

It is a Curzon number.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56181863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13696 + ... + 17318.

It is an arithmetic number, because the mean of its divisors is an integer number (6768424).

Almost surely, 2^56181861 is an apocalyptic number.

It is an amenable number.

56181861 is a deficient number, since it is larger than the sum of its proper divisors (25039227).

56181861 is a wasteful number, since it uses less digits than its factorization.

56181861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5352 (or 5349 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 56181861 is about 7495.4560234852. The cubic root of 56181861 is about 382.9999409181. Note that the first 4 decimals are identical.

The spelling of 56181861 in words is "fifty-six million, one hundred eighty-one thousand, eight hundred sixty-one".