2691944191 has 2 divisors, whose sum is σ = 2691944192. Its totient is φ = 2691944190.

The previous prime is 2691944153. The next prime is 2691944201. The reversal of 2691944191 is 1914491962.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2691944191 - 2²³ = 2683555583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2691944891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1345972095 + 1345972096.

It is an arithmetic number, because the mean of its divisors is an integer number (1345972096).

Almost surely, 2^2691944191 is an apocalyptic number.

2691944191 is a deficient number, since it is larger than the sum of its proper divisors (1).

2691944191 is an equidigital number, since it uses as much as digits as its factorization.

2691944191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 46.

The square root of 2691944191 is about 51883.9492617900. The cubic root of 2691944191 is about 1391.0903907275.

The spelling of 2691944191 in words is "two billion, six hundred ninety-one million, nine hundred forty-four thousand, one hundred ninety-one".