2091239 has 2 divisors, whose sum is σ = 2091240. Its totient is φ = 2091238.

The previous prime is 2091227. The next prime is 2091241. The reversal of 2091239 is 9321902.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2091239 is a prime.

Together with 2091241, 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 (2091269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1045619 + 1045620.

It is an arithmetic number, because the mean of its divisors is an integer number (1045620).

2^2091239 is an apocalyptic number.

2091239 is a deficient number, since it is larger than the sum of its proper divisors (1).

2091239 is an equidigital number, since it uses as much as digits as its factorization.

2091239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 2091239 is about 1446.1116831006. Note that the first 3 decimals coincide. The cubic root of 2091239 is about 127.8795864658.

The spelling of 2091239 in words is "two million, ninety-one thousand, two hundred thirty-nine".