634261613 has 2 divisors, whose sum is σ = 634261614. Its totient is φ = 634261612.

The previous prime is 634261603. The next prime is 634261627. The reversal of 634261613 is 316162436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 335732329 + 298529284 = 18323^2 + 17278^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634261613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 634261613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (634261603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317130806 + 317130807.

It is an arithmetic number, because the mean of its divisors is an integer number (317130807).

Almost surely, 2^634261613 is an apocalyptic number.

It is an amenable number.

634261613 is a deficient number, since it is larger than the sum of its proper divisors (1).

634261613 is an equidigital number, since it uses as much as digits as its factorization.

634261613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 32.

The square root of 634261613 is about 25184.5510779922. The cubic root of 634261613 is about 859.1905187308.

The spelling of 634261613 in words is "six hundred thirty-four million, two hundred sixty-one thousand, six hundred thirteen".