656891513 has 2 divisors, whose sum is σ = 656891514. Its totient is φ = 656891512.

The previous prime is 656891489. The next prime is 656891537. The reversal of 656891513 is 315198656.

It is a balanced prime because it is at equal distance from previous prime (656891489) and next prime (656891537).

It can be written as a sum of positive squares in only one way, i.e., 474019984 + 182871529 = 21772^2 + 13523^2 .

It is a cyclic number.

It is not a de Polignac number, because 656891513 - 2¹⁶ = 656825977 is a prime.

It is not a weakly prime, because it can be changed into another prime (656191513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328445756 + 328445757.

It is an arithmetic number, because the mean of its divisors is an integer number (328445757).

Almost surely, 2^656891513 is an apocalyptic number.

It is an amenable number.

656891513 is a deficient number, since it is larger than the sum of its proper divisors (1).

656891513 is an equidigital number, since it uses as much as digits as its factorization.

656891513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 194400, while the sum is 44.

The square root of 656891513 is about 25629.8949080951. The cubic root of 656891513 is about 869.2897329755.

The spelling of 656891513 in words is "six hundred fifty-six million, eight hundred ninety-one thousand, five hundred thirteen".