634397617 has 4 divisors (see below), whose sum is σ = 725025856. Its totient is φ = 543769380.

The previous prime is 634397539. The next prime is 634397627. The reversal of 634397617 is 716793436.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 634397617 - 2¹¹ = 634395569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634397627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45314109 + ... + 45314122.

It is an arithmetic number, because the mean of its divisors is an integer number (181256464).

Almost surely, 2^634397617 is an apocalyptic number.

It is an amenable number.

634397617 is a deficient number, since it is larger than the sum of its proper divisors (90628239).

634397617 is an equidigital number, since it uses as much as digits as its factorization.

634397617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90628238.

The product of its digits is 571536, while the sum is 46.

The square root of 634397617 is about 25187.2510806559. The cubic root of 634397617 is about 859.2519260920.

The spelling of 634397617 in words is "six hundred thirty-four million, three hundred ninety-seven thousand, six hundred seventeen".