2991988797 has 16 divisors (see below), whose sum is σ = 4827411072. Its totient is φ = 1609136640.

The previous prime is 2991988793. The next prime is 2991988799. The reversal of 2991988797 is 7978891992.

It is not a de Polignac number, because 2991988797 - 2² = 2991988793 is a prime.

It is a super-2 number, since 2×2991988797² = 17903993922747014418, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2991988793) 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, 4190104 + ... + 4190817.

It is an arithmetic number, because the mean of its divisors is an integer number (301713192).

Almost surely, 2^2991988797 is an apocalyptic number.

It is an amenable number.

2991988797 is a deficient number, since it is larger than the sum of its proper divisors (1835422275).

2991988797 is a wasteful number, since it uses less digits than its factorization.

2991988797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8380948.

The product of its digits is 41150592, while the sum is 69.

The square root of 2991988797 is about 54699.0749190514. The cubic root of 2991988797 is about 1440.9646309617.

The spelling of 2991988797 in words is "two billion, nine hundred ninety-one million, nine hundred eighty-eight thousand, seven hundred ninety-seven".