2991938023 has 2 divisors, whose sum is σ = 2991938024. Its totient is φ = 2991938022.

The previous prime is 2991938021. The next prime is 2991938039. The reversal of 2991938023 is 3208391992.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2991938023 - 2¹ = 2991938021 is a prime.

Together with 2991938021, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2991938021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1495969011 + 1495969012.

It is an arithmetic number, because the mean of its divisors is an integer number (1495969012).

Almost surely, 2^2991938023 is an apocalyptic number.

2991938023 is a deficient number, since it is larger than the sum of its proper divisors (1).

2991938023 is an equidigital number, since it uses as much as digits as its factorization.

2991938023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 209952, while the sum is 46.

The square root of 2991938023 is about 54698.6107958877. The cubic root of 2991938023 is about 1440.9564798670.

The spelling of 2991938023 in words is "two billion, nine hundred ninety-one million, nine hundred thirty-eight thousand, twenty-three".