56997989 has 2 divisors, whose sum is σ = 56997990. Its totient is φ = 56997988.

The previous prime is 56997959. The next prime is 56998027. The reversal of 56997989 is 98979965.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46648900 + 10349089 = 6830^2 + 3217^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56997989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56997959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28498994 + 28498995.

It is an arithmetic number, because the mean of its divisors is an integer number (28498995).

Almost surely, 2^56997989 is an apocalyptic number.

It is an amenable number.

56997989 is a deficient number, since it is larger than the sum of its proper divisors (1).

56997989 is an equidigital number, since it uses as much as digits as its factorization.

56997989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11022480, while the sum is 62.

The square root of 56997989 is about 7549.7012523675. The cubic root of 56997989 is about 384.8455871471.

The spelling of 56997989 in words is "fifty-six million, nine hundred ninety-seven thousand, nine hundred eighty-nine".