634366861 has 4 divisors (see below), whose sum is σ = 643056892. Its totient is φ = 625676832.

The previous prime is 634366819. The next prime is 634366867. The reversal of 634366861 is 168663436.

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

It can be written as a sum of positive squares in 2 ways, for example, as 460917961 + 173448900 = 21469^2 + 13170^2 .

It is a cyclic number.

It is not a de Polignac number, because 634366861 - 2⁹ = 634366349 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 (634366867) 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, 4344906 + ... + 4345051.

It is an arithmetic number, because the mean of its divisors is an integer number (160764223).

Almost surely, 2^634366861 is an apocalyptic number.

It is an amenable number.

634366861 is a deficient number, since it is larger than the sum of its proper divisors (8690031).

634366861 is an equidigital number, since it uses as much as digits as its factorization.

634366861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8690030.

The product of its digits is 373248, while the sum is 43.

The square root of 634366861 is about 25186.6405262790. The cubic root of 634366861 is about 859.2380401743.

The spelling of 634366861 in words is "six hundred thirty-four million, three hundred sixty-six thousand, eight hundred sixty-one".