634813409 has 16 divisors (see below), whose sum is σ = 674472960. Its totient is φ = 596220240.

The previous prime is 634813367. The next prime is 634813423. The reversal of 634813409 is 904318436.

It is a cyclic number.

It is not a de Polignac number, because 634813409 - 2¹² = 634809313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634813469) 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, 756212 + ... + 757050.

It is an arithmetic number, because the mean of its divisors is an integer number (42154560).

Almost surely, 2^634813409 is an apocalyptic number.

It is an amenable number.

634813409 is a deficient number, since it is larger than the sum of its proper divisors (39659551).

634813409 is a wasteful number, since it uses less digits than its factorization.

634813409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1420.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 634813409 is about 25195.5037457083. The cubic root of 634813409 is about 859.4396065218.

The spelling of 634813409 in words is "six hundred thirty-four million, eight hundred thirteen thousand, four hundred nine".