634842517 has 8 divisors (see below), whose sum is σ = 638283800. Its totient is φ = 631411200.

The previous prime is 634842493. The next prime is 634842539. The reversal of 634842517 is 715248436.

It can be written as a sum of positive squares in 4 ways, for example, as 256036 + 634586481 = 506^2 + 25191^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 634842517 - 2²³ = 626453909 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 634842517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634842557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149017 + ... + 153217.

It is an arithmetic number, because the mean of its divisors is an integer number (79785475).

Almost surely, 2^634842517 is an apocalyptic number.

It is an amenable number.

634842517 is a deficient number, since it is larger than the sum of its proper divisors (3441283).

634842517 is a wasteful number, since it uses less digits than its factorization.

634842517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4983.

The product of its digits is 161280, while the sum is 40.

The square root of 634842517 is about 25196.0813818340. The cubic root of 634842517 is about 859.4527422377.

The spelling of 634842517 in words is "six hundred thirty-four million, eight hundred forty-two thousand, five hundred seventeen".