3091991812 has 24 divisors (see below), whose sum is σ = 6659675456. Its totient is φ = 1223205408.

The previous prime is 3091991761. The next prime is 3091991843. The reversal of 3091991812 is 2181991903.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4246878 + ... + 4247605.

Almost surely, 2^3091991812 is an apocalyptic number.

It is an amenable number.

3091991812 is an abundant number, since it is smaller than the sum of its proper divisors (3567683644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3091991812 is a wasteful number, since it uses less digits than its factorization.

3091991812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8494507 (or 8494505 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 3091991812 is about 55605.6814723100. The cubic root of 3091991812 is about 1456.8430900151.

Subtracting from 3091991812 its reverse (2181991903), we obtain a palindrome (909999909).

The spelling of 3091991812 in words is "three billion, ninety-one million, nine hundred ninety-one thousand, eight hundred twelve".