2691637939 has 2 divisors, whose sum is σ = 2691637940. Its totient is φ = 2691637938.

The previous prime is 2691637891. The next prime is 2691637943. The reversal of 2691637939 is 9397361962.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2691637939 - 2⁹ = 2691637427 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2691637939.

It is not a weakly prime, because it can be changed into another prime (2691637979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1345818969 + 1345818970.

It is an arithmetic number, because the mean of its divisors is an integer number (1345818970).

Almost surely, 2^2691637939 is an apocalyptic number.

2691637939 is a deficient number, since it is larger than the sum of its proper divisors (1).

2691637939 is an equidigital number, since it uses as much as digits as its factorization.

2691637939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3306744, while the sum is 55.

The square root of 2691637939 is about 51880.9978604884. The cubic root of 2691637939 is about 1391.0376357494.

The spelling of 2691637939 in words is "two billion, six hundred ninety-one million, six hundred thirty-seven thousand, nine hundred thirty-nine".