3609904434891 has 4 divisors (see below), whose sum is σ = 4813205913192. Its totient is φ = 2406602956592.

The previous prime is 3609904434889. The next prime is 3609904434901. The reversal of 3609904434891 is 1984344099063.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3609904434891 - 2¹ = 3609904434889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3609904434841) 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, 601650739146 + ... + 601650739151.

It is an arithmetic number, because the mean of its divisors is an integer number (1203301478298).

Almost surely, 2^{3609904434891} is an apocalyptic number.

3609904434891 is a deficient number, since it is larger than the sum of its proper divisors (1203301478301).

3609904434891 is a wasteful number, since it uses less digits than its factorization.

3609904434891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1203301478300.

The product of its (nonzero) digits is 20155392, while the sum is 60.

The spelling of 3609904434891 in words is "three trillion, six hundred nine billion, nine hundred four million, four hundred thirty-four thousand, eight hundred ninety-one".