634963517 has 2 divisors, whose sum is σ = 634963518. Its totient is φ = 634963516.

The previous prime is 634963501. The next prime is 634963519. The reversal of 634963517 is 715369436.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 594335641 + 40627876 = 24379^2 + 6374^2 .

It is a cyclic number.

It is not a de Polignac number, because 634963517 - 2⁴ = 634963501 is a prime.

Together with 634963519, 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 (634963519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317481758 + 317481759.

It is an arithmetic number, because the mean of its divisors is an integer number (317481759).

Almost surely, 2^634963517 is an apocalyptic number.

It is an amenable number.

634963517 is a deficient number, since it is larger than the sum of its proper divisors (1).

634963517 is an equidigital number, since it uses as much as digits as its factorization.

634963517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 44.

The square root of 634963517 is about 25198.4824344642. The cubic root of 634963517 is about 859.5073422226.

The spelling of 634963517 in words is "six hundred thirty-four million, nine hundred sixty-three thousand, five hundred seventeen".