634813 has 4 divisors (see below), whose sum is σ = 639520. Its totient is φ = 630108.

The previous prime is 634807. The next prime is 634817. The reversal of 634813 is 318436.

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 634813 - 2⁹ = 634301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634817) 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, 2145 + ... + 2422.

It is an arithmetic number, because the mean of its divisors is an integer number (159880).

2⁶³⁴⁸¹³ is an apocalyptic number.

It is an amenable number.

634813 is a deficient number, since it is larger than the sum of its proper divisors (4707).

634813 is a wasteful number, since it uses less digits than its factorization.

634813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4706.

The product of its digits is 1728, while the sum is 25.

The square root of 634813 is about 796.7515296502. The cubic root of 634813 is about 85.9439421947.

The spelling of 634813 in words is "six hundred thirty-four thousand, eight hundred thirteen".