656436289 has 2 divisors, whose sum is σ = 656436290. Its totient is φ = 656436288.

The previous prime is 656436271. The next prime is 656436383. The reversal of 656436289 is 982634656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 393347889 + 263088400 = 19833^2 + 16220^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-656436289 is a prime.

It is not a weakly prime, because it can be changed into another prime (656436889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328218144 + 328218145.

It is an arithmetic number, because the mean of its divisors is an integer number (328218145).

Almost surely, 2^656436289 is an apocalyptic number.

It is an amenable number.

656436289 is a deficient number, since it is larger than the sum of its proper divisors (1).

656436289 is an equidigital number, since it uses as much as digits as its factorization.

656436289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1866240, while the sum is 49.

The square root of 656436289 is about 25621.0126458733. The cubic root of 656436289 is about 869.0888814457.

The spelling of 656436289 in words is "six hundred fifty-six million, four hundred thirty-six thousand, two hundred eighty-nine".