2991558939 has 4 divisors (see below), whose sum is σ = 3988745256. Its totient is φ = 1994372624.

The previous prime is 2991558929. The next prime is 2991558959. The reversal of 2991558939 is 9398551992.

2991558939 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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 2991558939 - 2⁴ = 2991558923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2991558919) 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, 498593154 + ... + 498593159.

It is an arithmetic number, because the mean of its divisors is an integer number (997186314).

Almost surely, 2^2991558939 is an apocalyptic number.

2991558939 is a deficient number, since it is larger than the sum of its proper divisors (997186317).

2991558939 is an equidigital number, since it uses as much as digits as its factorization.

2991558939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997186316.

The product of its digits is 7873200, while the sum is 60.

The square root of 2991558939 is about 54695.1454792836. The cubic root of 2991558939 is about 1440.8956200259.

The spelling of 2991558939 in words is "two billion, nine hundred ninety-one million, five hundred fifty-eight thousand, nine hundred thirty-nine".