634957109 has 4 divisors (see below), whose sum is σ = 635764704. Its totient is φ = 634149516.

The previous prime is 634957091. The next prime is 634957133. The reversal of 634957109 is 901759436.

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 a cyclic number.

It is not a de Polignac number, because 634957109 - 2⁸ = 634956853 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 634957109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634956109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 402617 + ... + 404190.

It is an arithmetic number, because the mean of its divisors is an integer number (158941176).

Almost surely, 2^634957109 is an apocalyptic number.

It is an amenable number.

634957109 is a deficient number, since it is larger than the sum of its proper divisors (807595).

634957109 is an equidigital number, since it uses as much as digits as its factorization.

634957109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807594.

The product of its (nonzero) digits is 204120, while the sum is 44.

The square root of 634957109 is about 25198.3552836291. The cubic root of 634957109 is about 859.5044508535.

The spelling of 634957109 in words is "six hundred thirty-four million, nine hundred fifty-seven thousand, one hundred nine".