56506181 has 8 divisors (see below), whose sum is σ = 61893720. Its totient is φ = 51347968.

The previous prime is 56506169. The next prime is 56506217. The reversal of 56506181 is 18160565.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 12496225 + 44009956 = 3535^2 + 6634^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 56506181 - 2⁶ = 56506117 is a prime.

It is a super-2 number, since 2×56506181² = 6385896982409522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56506111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56816 + ... + 57801.

It is an arithmetic number, because the mean of its divisors is an integer number (7736715).

Almost surely, 2^56506181 is an apocalyptic number.

It is an amenable number.

56506181 is a deficient number, since it is larger than the sum of its proper divisors (5387539).

56506181 is a wasteful number, since it uses less digits than its factorization.

56506181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114663.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 56506181 is about 7517.0593319462. The cubic root of 56506181 is about 383.7355062484.

The spelling of 56506181 in words is "fifty-six million, five hundred six thousand, one hundred eighty-one".