56381 has 4 divisors (see below), whose sum is σ = 60732. Its totient is φ = 52032.

The previous prime is 56377. The next prime is 56383. The reversal of 56381 is 18365.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18365 = 5 ⋅3673.

It can be written as a sum of positive squares in 2 ways, for example, as 3481 + 52900 = 59^2 + 230^2 .

It is a cyclic number.

It is not a de Polignac number, because 56381 - 2² = 56377 is a prime.

It is a super-2 number, since 2×56381² = 6357634322, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56383) 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, 2156 + ... + 2181.

It is an arithmetic number, because the mean of its divisors is an integer number (15183).

2⁵⁶³⁸¹ is an apocalyptic number.

It is an amenable number.

56381 is a deficient number, since it is larger than the sum of its proper divisors (4351).

56381 is a wasteful number, since it uses less digits than its factorization.

56381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4350.

The product of its digits is 720, while the sum is 23.

The square root of 56381 is about 237.4468361550. The cubic root of 56381 is about 38.3451927179.

The spelling of 56381 in words is "fifty-six thousand, three hundred eighty-one".