634343893 has 2 divisors, whose sum is σ = 634343894. Its totient is φ = 634343892.

The previous prime is 634343821. The next prime is 634343911. The reversal of 634343893 is 398343436.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 447830244 + 186513649 = 21162^2 + 13657^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634343893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (634343293) 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, 317171946 + 317171947.

It is an arithmetic number, because the mean of its divisors is an integer number (317171947).

Almost surely, 2^634343893 is an apocalyptic number.

It is an amenable number.

634343893 is a deficient number, since it is larger than the sum of its proper divisors (1).

634343893 is an equidigital number, since it uses as much as digits as its factorization.

634343893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 43.

The square root of 634343893 is about 25186.1845661466. The cubic root of 634343893 is about 859.2276701405.

The spelling of 634343893 in words is "six hundred thirty-four million, three hundred forty-three thousand, eight hundred ninety-three".