56997389 has 2 divisors, whose sum is σ = 56997390. Its totient is φ = 56997388.

The previous prime is 56997377. The next prime is 56997461. The reversal of 56997389 is 98379965.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32296489 + 24700900 = 5683^2 + 4970^2 .

It is a cyclic number.

It is not a de Polignac number, because 56997389 - 2⁴ = 56997373 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56997329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28498694 + 28498695.

It is an arithmetic number, because the mean of its divisors is an integer number (28498695).

Almost surely, 2^56997389 is an apocalyptic number.

It is an amenable number.

56997389 is a deficient number, since it is larger than the sum of its proper divisors (1).

56997389 is an equidigital number, since it uses as much as digits as its factorization.

56997389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3674160, while the sum is 56.

The square root of 56997389 is about 7549.6615155913. The cubic root of 56997389 is about 384.8442367593.

The spelling of 56997389 in words is "fifty-six million, nine hundred ninety-seven thousand, three hundred eighty-nine".