613568257 has 2 divisors, whose sum is σ = 613568258. Its totient is φ = 613568256.

The previous prime is 613568243. The next prime is 613568323. The reversal of 613568257 is 752865316.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 532640241 + 80928016 = 23079^2 + 8996^2 .

It is a cyclic number.

It is not a de Polignac number, because 613568257 - 2⁷ = 613568129 is a prime.

It is not a weakly prime, because it can be changed into another prime (613560257) 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, 306784128 + 306784129.

It is an arithmetic number, because the mean of its divisors is an integer number (306784129).

Almost surely, 2^613568257 is an apocalyptic number.

It is an amenable number.

613568257 is a deficient number, since it is larger than the sum of its proper divisors (1).

613568257 is an equidigital number, since it uses as much as digits as its factorization.

613568257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302400, while the sum is 43.

The square root of 613568257 is about 24770.3099899860. The cubic root of 613568257 is about 849.7430628255.

The spelling of 613568257 in words is "six hundred thirteen million, five hundred sixty-eight thousand, two hundred fifty-seven".