634873161 has 16 divisors (see below), whose sum is σ = 912098880. Its totient is φ = 390482880.

The previous prime is 634873159. The next prime is 634873181. The reversal of 634873161 is 161378436.

634873161 is a nontrivial binomial coefficient, being equal to C(35634, 2).

It is not a de Polignac number, because 634873161 - 2¹ = 634873159 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (634873111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103930 + ... + 109868.

It is an arithmetic number, because the mean of its divisors is an integer number (57006180).

Almost surely, 2^634873161 is an apocalyptic number.

634873161 is the 35633-rd triangular number and also the 17817-th hexagonal number.

It is an amenable number.

634873161 is a deficient number, since it is larger than the sum of its proper divisors (277225719).

634873161 is a wasteful number, since it uses less digits than its factorization.

634873161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8696.

The product of its digits is 72576, while the sum is 39.

The square root of 634873161 is about 25196.6894849304. The cubic root of 634873161 is about 859.4665706783.

The spelling of 634873161 in words is "six hundred thirty-four million, eight hundred seventy-three thousand, one hundred sixty-one".