634479613 has 4 divisors (see below), whose sum is σ = 634612320. Its totient is φ = 634346908.

The previous prime is 634479611. The next prime is 634479623. The reversal of 634479613 is 316974436.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 634479613 - 2¹ = 634479611 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 634479613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634479611) 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, 58903 + ... + 68836.

It is an arithmetic number, because the mean of its divisors is an integer number (158653080).

Almost surely, 2^634479613 is an apocalyptic number.

It is an amenable number.

634479613 is a deficient number, since it is larger than the sum of its proper divisors (132707).

634479613 is a wasteful number, since it uses less digits than its factorization.

634479613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132706.

The product of its digits is 326592, while the sum is 43.

The square root of 634479613 is about 25188.8787563083. The cubic root of 634479613 is about 859.2889439831.

The spelling of 634479613 in words is "six hundred thirty-four million, four hundred seventy-nine thousand, six hundred thirteen".