613656961 has 2 divisors, whose sum is σ = 613656962. Its totient is φ = 613656960.

The previous prime is 613656943. The next prime is 613656991. The reversal of 613656961 is 169656316.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 535228225 + 78428736 = 23135^2 + 8856^2 .

It is a cyclic number.

It is not a de Polignac number, because 613656961 - 2¹⁷ = 613525889 is a prime.

It is not a weakly prime, because it can be changed into another prime (613656941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306828480 + 306828481.

It is an arithmetic number, because the mean of its divisors is an integer number (306828481).

Almost surely, 2^613656961 is an apocalyptic number.

It is an amenable number.

613656961 is a deficient number, since it is larger than the sum of its proper divisors (1).

613656961 is an equidigital number, since it uses as much as digits as its factorization.

613656961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 43.

The square root of 613656961 is about 24772.1004559565. The cubic root of 613656961 is about 849.7840101723.

The spelling of 613656961 in words is "six hundred thirteen million, six hundred fifty-six thousand, nine hundred sixty-one".