2891491564 has 12 divisors (see below), whose sum is σ = 5449349584. Its totient is φ = 1334534544.

The previous prime is 2891491481. The next prime is 2891491579. The reversal of 2891491564 is 4651941982.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27802752 + ... + 27802855.

Almost surely, 2^2891491564 is an apocalyptic number.

It is an amenable number.

2891491564 is a deficient number, since it is larger than the sum of its proper divisors (2557858020).

2891491564 is a wasteful number, since it uses less digits than its factorization.

2891491564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55605624 (or 55605622 counting only the distinct ones).

The product of its digits is 622080, while the sum is 49.

The square root of 2891491564 is about 53772.5911966310. The cubic root of 2891491564 is about 1424.6471376638.

The spelling of 2891491564 in words is "two billion, eight hundred ninety-one million, four hundred ninety-one thousand, five hundred sixty-four".