56319381 has 24 divisors (see below), whose sum is σ = 84817824. Its totient is φ = 37344240.

The previous prime is 56319377. The next prime is 56319391. The reversal of 56319381 is 18391365.

It is a happy number.

56319381 is a `hidden beast` number, since 563 + 1 + 93 + 8 + 1 = 666.

It is not a de Polignac number, because 56319381 - 2² = 56319377 is a prime.

It is a super-2 number, since 2×56319381² = 6343745352446322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56319331) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54651 + ... + 55671.

It is an arithmetic number, because the mean of its divisors is an integer number (3534076).

Almost surely, 2^56319381 is an apocalyptic number.

It is an amenable number.

56319381 is a deficient number, since it is larger than the sum of its proper divisors (28498443).

56319381 is a wasteful number, since it uses less digits than its factorization.

56319381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1263 (or 1251 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 56319381 is about 7504.6239745906. The cubic root of 56319381 is about 383.3121842564.

The spelling of 56319381 in words is "fifty-six million, three hundred nineteen thousand, three hundred eighty-one".