634343189 has 2 divisors, whose sum is σ = 634343190. Its totient is φ = 634343188.

The previous prime is 634343141. The next prime is 634343191. The reversal of 634343189 is 981343436.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 351262564 + 283080625 = 18742^2 + 16825^2 .

It is a cyclic number.

It is not a de Polignac number, because 634343189 - 2²⁸ = 365907733 is a prime.

Together with 634343191, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (634343119) 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 as a sum of consecutive naturals, namely, 317171594 + 317171595.

It is an arithmetic number, because the mean of its divisors is an integer number (317171595).

Almost surely, 2^634343189 is an apocalyptic number.

It is an amenable number.

634343189 is a deficient number, since it is larger than the sum of its proper divisors (1).

634343189 is an equidigital number, since it uses as much as digits as its factorization.

634343189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 41.

The square root of 634343189 is about 25186.1705902267. The cubic root of 634343189 is about 859.2273522811.

The spelling of 634343189 in words is "six hundred thirty-four million, three hundred forty-three thousand, one hundred eighty-nine".