2691944891 has 2 divisors, whose sum is σ = 2691944892. Its totient is φ = 2691944890.

The previous prime is 2691944887. The next prime is 2691944933. The reversal of 2691944891 is 1984491962.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2691944891 - 2² = 2691944887 is a prime.

It is not a weakly prime, because it can be changed into another prime (2691944191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1345972445 + 1345972446.

It is an arithmetic number, because the mean of its divisors is an integer number (1345972446).

Almost surely, 2^2691944891 is an apocalyptic number.

2691944891 is a deficient number, since it is larger than the sum of its proper divisors (1).

2691944891 is an equidigital number, since it uses as much as digits as its factorization.

2691944891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1119744, while the sum is 53.

The square root of 2691944891 is about 51883.9560076138. The cubic root of 2691944891 is about 1391.0905113050.

The spelling of 2691944891 in words is "two billion, six hundred ninety-one million, nine hundred forty-four thousand, eight hundred ninety-one".