634791 has 4 divisors (see below), whose sum is σ = 846392. Its totient is φ = 423192.

The previous prime is 634759. The next prime is 634793. The reversal of 634791 is 197436.

It is a happy number.

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

It is not a de Polignac number, because 634791 - 2⁵ = 634759 is a prime.

It is a super-2 number, since 2×634791² = 805919227362, which contains 22 as substring.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105796 + ... + 105801.

It is an arithmetic number, because the mean of its divisors is an integer number (211598).

2⁶³⁴⁷⁹¹ is an apocalyptic number.

634791 is a deficient number, since it is larger than the sum of its proper divisors (211601).

634791 is a wasteful number, since it uses less digits than its factorization.

634791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211600.

The product of its digits is 4536, while the sum is 30.

The square root of 634791 is about 796.7377234699. The cubic root of 634791 is about 85.9429493624.

The spelling of 634791 in words is "six hundred thirty-four thousand, seven hundred ninety-one".