2991916331 has 4 divisors (see below), whose sum is σ = 2992618200. Its totient is φ = 2991214464.

The previous prime is 2991916327. The next prime is 2991916351. The reversal of 2991916331 is 1336191992.

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 2991916331 - 2² = 2991916327 is a prime.

It is a super-2 number, since 2×2991916331² = 17903126663409003122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2991916351) 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, 344501 + ... + 353078.

It is an arithmetic number, because the mean of its divisors is an integer number (748154550).

Almost surely, 2^2991916331 is an apocalyptic number.

2991916331 is a deficient number, since it is larger than the sum of its proper divisors (701869).

2991916331 is an equidigital number, since it uses as much as digits as its factorization.

2991916331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701868.

The product of its digits is 78732, while the sum is 44.

The square root of 2991916331 is about 54698.4125089568. The cubic root of 2991916331 is about 1440.9529974750.

The spelling of 2991916331 in words is "two billion, nine hundred ninety-one million, nine hundred sixteen thousand, three hundred thirty-one".