634693791 has 4 divisors (see below), whose sum is σ = 846258392. Its totient is φ = 423129192.

The previous prime is 634693789. The next prime is 634693823. The reversal of 634693791 is 197396436.

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

It is not a de Polignac number, because 634693791 - 2¹ = 634693789 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 634693791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634693751) 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, 105782296 + ... + 105782301.

It is an arithmetic number, because the mean of its divisors is an integer number (211564598).

Almost surely, 2^634693791 is an apocalyptic number.

634693791 is a deficient number, since it is larger than the sum of its proper divisors (211564601).

634693791 is a wasteful number, since it uses less digits than its factorization.

634693791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211564600.

The product of its digits is 734832, while the sum is 48.

The square root of 634693791 is about 25193.1298373187. The cubic root of 634693791 is about 859.3856216798.

The spelling of 634693791 in words is "six hundred thirty-four million, six hundred ninety-three thousand, seven hundred ninety-one".