56136881 has 4 divisors (see below), whose sum is σ = 57654132. Its totient is φ = 54619632.

The previous prime is 56136869. The next prime is 56136889. The reversal of 56136881 is 18863165.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18863165 = 5 ⋅3772633.

It can be written as a sum of positive squares in 2 ways, for example, as 38328481 + 17808400 = 6191^2 + 4220^2 .

It is a cyclic number.

It is not a de Polignac number, because 56136881 - 2¹⁴ = 56120497 is a prime.

It is a super-2 number, since 2×56136881² = 6302698816816322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56136889) 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, 758570 + ... + 758643.

It is an arithmetic number, because the mean of its divisors is an integer number (14413533).

Almost surely, 2^56136881 is an apocalyptic number.

It is an amenable number.

56136881 is a deficient number, since it is larger than the sum of its proper divisors (1517251).

56136881 is a wasteful number, since it uses less digits than its factorization.

56136881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1517250.

The product of its digits is 34560, while the sum is 38.

The square root of 56136881 is about 7492.4549381361. The cubic root of 56136881 is about 382.8977018883.

The spelling of 56136881 in words is "fifty-six million, one hundred thirty-six thousand, eight hundred eighty-one".