634937851 has 4 divisors (see below), whose sum is σ = 635354104. Its totient is φ = 634521600.

The previous prime is 634937819. The next prime is 634937857. The reversal of 634937851 is 158739436.

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

It is a cyclic number.

It is not a de Polignac number, because 634937851 - 2⁵ = 634937819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634937857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205830 + ... + 208891.

It is an arithmetic number, because the mean of its divisors is an integer number (158838526).

Almost surely, 2^634937851 is an apocalyptic number.

634937851 is a deficient number, since it is larger than the sum of its proper divisors (416253).

634937851 is a wasteful number, since it uses less digits than its factorization.

634937851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416252.

The product of its digits is 544320, while the sum is 46.

The square root of 634937851 is about 25197.9731526169. The cubic root of 634937851 is about 859.4957612881.

The spelling of 634937851 in words is "six hundred thirty-four million, nine hundred thirty-seven thousand, eight hundred fifty-one".