56207981 has 2 divisors, whose sum is σ = 56207982. Its totient is φ = 56207980.

The previous prime is 56207971. The next prime is 56207989. The reversal of 56207981 is 18970265.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38068900 + 18139081 = 6170^2 + 4259^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56207981 is a prime.

It is a super-2 number, since 2×56207981² = 6318674256192722, 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 (56207989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28103990 + 28103991.

It is an arithmetic number, because the mean of its divisors is an integer number (28103991).

Almost surely, 2^56207981 is an apocalyptic number.

It is an amenable number.

56207981 is a deficient number, since it is larger than the sum of its proper divisors (1).

56207981 is an equidigital number, since it uses as much as digits as its factorization.

56207981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 56207981 is about 7497.1982099982. The cubic root of 56207981 is about 383.0592863387.

The spelling of 56207981 in words is "fifty-six million, two hundred seven thousand, nine hundred eighty-one".