656191513 has 2 divisors, whose sum is σ = 656191514. Its totient is φ = 656191512.

The previous prime is 656191433. The next prime is 656191531. The reversal of 656191513 is 315191656.

Together with next prime (656191531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 440454169 + 215737344 = 20987^2 + 14688^2 .

It is a cyclic number.

It is not a de Polignac number, because 656191513 - 2¹³ = 656183321 is a prime.

It is not a weakly prime, because it can be changed into another prime (656191573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328095756 + 328095757.

It is an arithmetic number, because the mean of its divisors is an integer number (328095757).

Almost surely, 2^656191513 is an apocalyptic number.

It is an amenable number.

656191513 is a deficient number, since it is larger than the sum of its proper divisors (1).

656191513 is an equidigital number, since it uses as much as digits as its factorization.

656191513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24300, while the sum is 37.

The square root of 656191513 is about 25616.2353401119. The cubic root of 656191513 is about 868.9808442806.

The spelling of 656191513 in words is "six hundred fifty-six million, one hundred ninety-one thousand, five hundred thirteen".