2691239 has 2 divisors, whose sum is σ = 2691240. Its totient is φ = 2691238.

The previous prime is 2691233. The next prime is 2691251. The reversal of 2691239 is 9321962.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2691239 - 2⁴ = 2691223 is a prime.

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 (2691233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1345619 + 1345620.

It is an arithmetic number, because the mean of its divisors is an integer number (1345620).

2^2691239 is an apocalyptic number.

2691239 is a deficient number, since it is larger than the sum of its proper divisors (1).

2691239 is an equidigital number, since it uses as much as digits as its factorization.

2691239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 32.

The square root of 2691239 is about 1640.4996190185. The cubic root of 2691239 is about 139.0968908504.

The spelling of 2691239 in words is "two million, six hundred ninety-one thousand, two hundred thirty-nine".