634556189 has 4 divisors (see below), whose sum is σ = 639188124. Its totient is φ = 629924256.

The previous prime is 634556183. The next prime is 634556201. The reversal of 634556189 is 981655436.

It is a happy number.

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 499880164 + 134676025 = 22358^2 + 11605^2 .

It is a cyclic number.

It is not a de Polignac number, because 634556189 - 2⁴ = 634556173 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 (634556183) 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, 2315762 + ... + 2316035.

It is an arithmetic number, because the mean of its divisors is an integer number (159797031).

Almost surely, 2^634556189 is an apocalyptic number.

It is an amenable number.

634556189 is a deficient number, since it is larger than the sum of its proper divisors (4631935).

634556189 is a wasteful number, since it uses less digits than its factorization.

634556189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4631934.

The product of its digits is 777600, while the sum is 47.

The square root of 634556189 is about 25190.3987463478. The cubic root of 634556189 is about 859.3235120826.

The spelling of 634556189 in words is "six hundred thirty-four million, five hundred fifty-six thousand, one hundred eighty-nine".