56072381 has 2 divisors, whose sum is σ = 56072382. Its totient is φ = 56072380.

The previous prime is 56072377. The next prime is 56072407. The reversal of 56072381 is 18327065.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45346756 + 10725625 = 6734^2 + 3275^2 .

It is a cyclic number.

It is not a de Polignac number, because 56072381 - 2² = 56072377 is a prime.

It is a super-2 number, since 2×56072381² = 6288223822018322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56072351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28036190 + 28036191.

It is an arithmetic number, because the mean of its divisors is an integer number (28036191).

Almost surely, 2^56072381 is an apocalyptic number.

It is an amenable number.

56072381 is a deficient number, since it is larger than the sum of its proper divisors (1).

56072381 is an equidigital number, since it uses as much as digits as its factorization.

56072381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 56072381 is about 7488.1493708392. The cubic root of 56072381 is about 382.7509987697.

The spelling of 56072381 in words is "fifty-six million, seventy-two thousand, three hundred eighty-one".