634785013 has 2 divisors, whose sum is σ = 634785014. Its totient is φ = 634785012.

The previous prime is 634784999. The next prime is 634785037. The reversal of 634785013 is 310587436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 567249489 + 67535524 = 23817^2 + 8218^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634785013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (634785313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317392506 + 317392507.

It is an arithmetic number, because the mean of its divisors is an integer number (317392507).

Almost surely, 2^634785013 is an apocalyptic number.

It is an amenable number.

634785013 is a deficient number, since it is larger than the sum of its proper divisors (1).

634785013 is an equidigital number, since it uses as much as digits as its factorization.

634785013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 634785013 is about 25194.9402261645. The cubic root of 634785013 is about 859.4267917269.

The spelling of 634785013 in words is "six hundred thirty-four million, seven hundred eighty-five thousand, thirteen".