634242517 has 2 divisors, whose sum is σ = 634242518. Its totient is φ = 634242516.

The previous prime is 634242491. The next prime is 634242527. The reversal of 634242517 is 715242436.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 455993316 + 178249201 = 21354^2 + 13351^2 .

It is a cyclic number.

It is not a de Polignac number, because 634242517 - 2²³ = 625853909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (634242527) 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, 317121258 + 317121259.

It is an arithmetic number, because the mean of its divisors is an integer number (317121259).

Almost surely, 2^634242517 is an apocalyptic number.

It is an amenable number.

634242517 is a deficient number, since it is larger than the sum of its proper divisors (1).

634242517 is an equidigital number, since it uses as much as digits as its factorization.

634242517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 34.

The square root of 634242517 is about 25184.1719538285. The cubic root of 634242517 is about 859.1818959656.

The spelling of 634242517 in words is "six hundred thirty-four million, two hundred forty-two thousand, five hundred seventeen".