2091431 has 2 divisors, whose sum is σ = 2091432. Its totient is φ = 2091430.

The previous prime is 2091421. The next prime is 2091437. The reversal of 2091431 is 1341902.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2091431 is a prime.

It is a super-2 number, since 2×2091431² = 8748167255522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2091437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1045715 + 1045716.

It is an arithmetic number, because the mean of its divisors is an integer number (1045716).

2^2091431 is an apocalyptic number.

2091431 is a deficient number, since it is larger than the sum of its proper divisors (1).

2091431 is an equidigital number, since it uses as much as digits as its factorization.

2091431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 2091431 is about 1446.1780664911. The cubic root of 2091431 is about 127.8834999559.

The spelling of 2091431 in words is "two million, ninety-one thousand, four hundred thirty-one".