2691191 has 2 divisors, whose sum is σ = 2691192. Its totient is φ = 2691190.

The previous prime is 2691187. The next prime is 2691193. The reversal of 2691191 is 1911962.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2691191 - 2² = 2691187 is a prime.

It is a Sophie Germain prime.

Together with 2691193, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2691193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1345595 + 1345596.

It is an arithmetic number, because the mean of its divisors is an integer number (1345596).

2^2691191 is an apocalyptic number.

2691191 is a deficient number, since it is larger than the sum of its proper divisors (1).

2691191 is an equidigital number, since it uses as much as digits as its factorization.

2691191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972, while the sum is 29.

The square root of 2691191 is about 1640.4849892638. The cubic root of 2691191 is about 139.0960638843.

It can be divided in two parts, 2691 and 191, that added together give a palindrome (2882).

The spelling of 2691191 in words is "two million, six hundred ninety-one thousand, one hundred ninety-one".