2891591906 has 32 divisors (see below), whose sum is σ = 5050926720. Its totient is φ = 1215878400.

The previous prime is 2891591887. The next prime is 2891591959. The reversal of 2891591906 is 6091951982.

It is a super-2 number, since 2×2891591906² = 16722607501689425672, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 353786 + ... + 361866.

It is an arithmetic number, because the mean of its divisors is an integer number (157841460).

Almost surely, 2^2891591906 is an apocalyptic number.

2891591906 is a deficient number, since it is larger than the sum of its proper divisors (2159334814).

2891591906 is a wasteful number, since it uses less digits than its factorization.

2891591906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8570.

The product of its (nonzero) digits is 349920, while the sum is 50.

The square root of 2891591906 is about 53773.5242103398. The cubic root of 2891591906 is about 1424.6636170813.

The spelling of 2891591906 in words is "two billion, eight hundred ninety-one million, five hundred ninety-one thousand, nine hundred six".