2691942391 has 2 divisors, whose sum is σ = 2691942392. Its totient is φ = 2691942390.

The previous prime is 2691942377. The next prime is 2691942413. The reversal of 2691942391 is 1932491962.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2691942391 - 2⁵ = 2691942359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2691949391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1345971195 + 1345971196.

It is an arithmetic number, because the mean of its divisors is an integer number (1345971196).

Almost surely, 2^2691942391 is an apocalyptic number.

2691942391 is a deficient number, since it is larger than the sum of its proper divisors (1).

2691942391 is an equidigital number, since it uses as much as digits as its factorization.

2691942391 is an odious number, because the sum of its binary digits is odd.

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

The square root of 2691942391 is about 51883.9319153820. The cubic root of 2691942391 is about 1391.0900806712.

The spelling of 2691942391 in words is "two billion, six hundred ninety-one million, nine hundred forty-two thousand, three hundred ninety-one".