634641311 has 2 divisors, whose sum is σ = 634641312. Its totient is φ = 634641310.

The previous prime is 634641281. The next prime is 634641313. The reversal of 634641311 is 113146436.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 634641311 - 2⁶ = 634641247 is a prime.

Together with 634641313, 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 (634641313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317320655 + 317320656.

It is an arithmetic number, because the mean of its divisors is an integer number (317320656).

Almost surely, 2^634641311 is an apocalyptic number.

634641311 is a deficient number, since it is larger than the sum of its proper divisors (1).

634641311 is an equidigital number, since it uses as much as digits as its factorization.

634641311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 29.

The square root of 634641311 is about 25192.0882619921. The cubic root of 634641311 is about 859.3619347717.

Adding to 634641311 its reverse (113146436), we get a palindrome (747787747).

The spelling of 634641311 in words is "six hundred thirty-four million, six hundred forty-one thousand, three hundred eleven".