634661351 has 16 divisors (see below), whose sum is σ = 687321600. Its totient is φ = 584117568.

The previous prime is 634661327. The next prime is 634661359. The reversal of 634661351 is 153166436.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634661351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634661359) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121571 + ... + 126683.

It is an arithmetic number, because the mean of its divisors is an integer number (42957600).

Almost surely, 2^634661351 is an apocalyptic number.

634661351 is a deficient number, since it is larger than the sum of its proper divisors (52660249).

634661351 is a wasteful number, since it uses less digits than its factorization.

634661351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5318.

The product of its digits is 38880, while the sum is 35.

The square root of 634661351 is about 25192.4860027747. The cubic root of 634661351 is about 859.3709800028.

The spelling of 634661351 in words is "six hundred thirty-four million, six hundred sixty-one thousand, three hundred fifty-one".