56662981 has 2 divisors, whose sum is σ = 56662982. Its totient is φ = 56662980.

The previous prime is 56662939. The next prime is 56663003. The reversal of 56662981 is 18926665.

56662981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30305025 + 26357956 = 5505^2 + 5134^2 .

It is a cyclic number.

It is not a de Polignac number, because 56662981 - 2⁹ = 56662469 is a prime.

It is a super-2 number, since 2×56662981² = 6421386831612722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56662181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28331490 + 28331491.

It is an arithmetic number, because the mean of its divisors is an integer number (28331491).

Almost surely, 2^56662981 is an apocalyptic number.

It is an amenable number.

56662981 is a deficient number, since it is larger than the sum of its proper divisors (1).

56662981 is an equidigital number, since it uses as much as digits as its factorization.

56662981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 43.

The square root of 56662981 is about 7527.4817170153. The cubic root of 56662981 is about 384.0901232514.

The spelling of 56662981 in words is "fifty-six million, six hundred sixty-two thousand, nine hundred eighty-one".