656897489 has 2 divisors, whose sum is σ = 656897490. Its totient is φ = 656897488.

The previous prime is 656897453. The next prime is 656897497. The reversal of 656897489 is 984798656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 633780625 + 23116864 = 25175^2 + 4808^2 .

It is a cyclic number.

It is not a de Polignac number, because 656897489 - 2²⁸ = 388462033 is a prime.

It is a super-2 number, since 2×656897489² = 863028622109010242, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (656897419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328448744 + 328448745.

It is an arithmetic number, because the mean of its divisors is an integer number (328448745).

Almost surely, 2^656897489 is an apocalyptic number.

It is an amenable number.

656897489 is a deficient number, since it is larger than the sum of its proper divisors (1).

656897489 is an equidigital number, since it uses as much as digits as its factorization.

656897489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26127360, while the sum is 62.

The square root of 656897489 is about 25630.0114904383. The cubic root of 656897489 is about 869.2923690575.

The spelling of 656897489 in words is "six hundred fifty-six million, eight hundred ninety-seven thousand, four hundred eighty-nine".