56761381 has 4 divisors (see below), whose sum is σ = 58718700. Its totient is φ = 54804064.

The previous prime is 56761361. The next prime is 56761399. The reversal of 56761381 is 18316765.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29877156 + 26884225 = 5466^2 + 5185^2 .

It is a cyclic number.

It is not a de Polignac number, because 56761381 - 2⁵ = 56761349 is a prime.

It is a super-2 number, since 2×56761381² = 6443708746054322, 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 56761381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56761301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 978616 + ... + 978673.

It is an arithmetic number, because the mean of its divisors is an integer number (14679675).

Almost surely, 2^56761381 is an apocalyptic number.

It is an amenable number.

56761381 is a deficient number, since it is larger than the sum of its proper divisors (1957319).

56761381 is a wasteful number, since it uses less digits than its factorization.

56761381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1957318.

The product of its digits is 30240, while the sum is 37.

The square root of 56761381 is about 7534.0149322921. The cubic root of 56761381 is about 384.3123295361.

The spelling of 56761381 in words is "fifty-six million, seven hundred sixty-one thousand, three hundred eighty-one".