634689313 has 4 divisors (see below), whose sum is σ = 635048260. Its totient is φ = 634330368.

The previous prime is 634689283. The next prime is 634689337. The reversal of 634689313 is 313986436.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 182574144 + 452115169 = 13512^2 + 21263^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634689313 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 634689313.

It is not an unprimeable number, because it can be changed into a prime (634689113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176808 + ... + 180361.

It is an arithmetic number, because the mean of its divisors is an integer number (158762065).

Almost surely, 2^634689313 is an apocalyptic number.

It is an amenable number.

634689313 is a deficient number, since it is larger than the sum of its proper divisors (358947).

634689313 is a wasteful number, since it uses less digits than its factorization.

634689313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358946.

The product of its digits is 279936, while the sum is 43.

The square root of 634689313 is about 25193.0409637265. The cubic root of 634689313 is about 859.3836005804.

It can be divided in two parts, 6346 and 89313, that added together give a palindrome (95659).

The spelling of 634689313 in words is "six hundred thirty-four million, six hundred eighty-nine thousand, three hundred thirteen".