634926009 has 4 divisors (see below), whose sum is σ = 846568016. Its totient is φ = 423284004.

The previous prime is 634925999. The next prime is 634926011. The reversal of 634926009 is 900629436.

It is a happy number.

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 634926009 - 2²¹ = 632828857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634926049) 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, 105820999 + ... + 105821004.

It is an arithmetic number, because the mean of its divisors is an integer number (211642004).

Almost surely, 2^634926009 is an apocalyptic number.

It is an amenable number.

634926009 is a deficient number, since it is larger than the sum of its proper divisors (211642007).

634926009 is a wasteful number, since it uses less digits than its factorization.

634926009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211642006.

The product of its (nonzero) digits is 69984, while the sum is 39.

The square root of 634926009 is about 25197.7381723043. The cubic root of 634926009 is about 859.4904178716.

The spelling of 634926009 in words is "six hundred thirty-four million, nine hundred twenty-six thousand, nine".