634013557 has 2 divisors, whose sum is σ = 634013558. Its totient is φ = 634013556.

The previous prime is 634013539. The next prime is 634013579. The reversal of 634013557 is 755310436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 351975121 + 282038436 = 18761^2 + 16794^2 .

It is a cyclic number.

It is not a de Polignac number, because 634013557 - 2¹¹ = 634011509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (634013357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317006778 + 317006779.

It is an arithmetic number, because the mean of its divisors is an integer number (317006779).

Almost surely, 2^634013557 is an apocalyptic number.

It is an amenable number.

634013557 is a deficient number, since it is larger than the sum of its proper divisors (1).

634013557 is an equidigital number, since it uses as much as digits as its factorization.

634013557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37800, while the sum is 34.

The square root of 634013557 is about 25179.6258312152. The cubic root of 634013557 is about 859.0784960000.

The spelling of 634013557 in words is "six hundred thirty-four million, thirteen thousand, five hundred fifty-seven".