2891688311 has 2 divisors, whose sum is σ = 2891688312. Its totient is φ = 2891688310.

The previous prime is 2891688227. The next prime is 2891688323. The reversal of 2891688311 is 1138861982.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2891688311 - 2¹⁰ = 2891687287 is a prime.

It is a super-2 number, since 2×2891688311² = 16723722575948065442, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2891688391) 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, 1445844155 + 1445844156.

It is an arithmetic number, because the mean of its divisors is an integer number (1445844156).

Almost surely, 2^2891688311 is an apocalyptic number.

2891688311 is a deficient number, since it is larger than the sum of its proper divisors (1).

2891688311 is an equidigital number, since it uses as much as digits as its factorization.

2891688311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 47.

The square root of 2891688311 is about 53774.4206012487. The cubic root of 2891688311 is about 1424.6794495563.

The spelling of 2891688311 in words is "two billion, eight hundred ninety-one million, six hundred eighty-eight thousand, three hundred eleven".