56818081 has 4 divisors (see below), whose sum is σ = 56835652. Its totient is φ = 56800512.

The previous prime is 56818061. The next prime is 56818123. The reversal of 56818081 is 18081865.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18081865 = 5 ⋅3616373.

It can be written as a sum of positive squares in 2 ways, for example, as 5107600 + 51710481 = 2260^2 + 7191^2 .

It is a cyclic number.

It is not a de Polignac number, because 56818081 - 2⁵ = 56818049 is a prime.

It is a super-2 number, since 2×56818081² = 6456588657045122, 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 56818081.

It is not an unprimeable number, because it can be changed into a prime (56818031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2376 + ... + 10921.

It is an arithmetic number, because the mean of its divisors is an integer number (14208913).

Almost surely, 2^56818081 is an apocalyptic number.

It is an amenable number.

56818081 is a deficient number, since it is larger than the sum of its proper divisors (17571).

56818081 is a wasteful number, since it uses less digits than its factorization.

56818081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17570.

The product of its (nonzero) digits is 15360, while the sum is 37.

The square root of 56818081 is about 7537.7769269195. The cubic root of 56818081 is about 384.4402525305.

The spelling of 56818081 in words is "fifty-six million, eight hundred eighteen thousand, eighty-one".