897564779 has 2 divisors, whose sum is σ = 897564780. Its totient is φ = 897564778.

The previous prime is 897564727. The next prime is 897564791. The reversal of 897564779 is 977465798.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 897564779 - 2⁸ = 897564523 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (897567779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 448782389 + 448782390.

It is an arithmetic number, because the mean of its divisors is an integer number (448782390).

Almost surely, 2^897564779 is an apocalyptic number.

897564779 is a deficient number, since it is larger than the sum of its proper divisors (1).

897564779 is an equidigital number, since it uses as much as digits as its factorization.

897564779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26671680, while the sum is 62.

The square root of 897564779 is about 29959.3854910277. The cubic root of 897564779 is about 964.6177905957.

The spelling of 897564779 in words is "eight hundred ninety-seven million, five hundred sixty-four thousand, seven hundred seventy-nine".