2291231 has 2 divisors, whose sum is σ = 2291232. Its totient is φ = 2291230.

The previous prime is 2291227. The next prime is 2291239. The reversal of 2291231 is 1321922.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2291231 - 2² = 2291227 is a prime.

It is a super-2 number, since 2×2291231² = 10499478990722, 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 (2291239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1145615 + 1145616.

It is an arithmetic number, because the mean of its divisors is an integer number (1145616).

2^2291231 is an apocalyptic number.

2291231 is a deficient number, since it is larger than the sum of its proper divisors (1).

2291231 is an equidigital number, since it uses as much as digits as its factorization.

2291231 is an odious number, because the sum of its binary digits is odd.

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

The square root of 2291231 is about 1513.6812742450. The cubic root of 2291231 is about 131.8326429708.

The spelling of 2291231 in words is "two million, two hundred ninety-one thousand, two hundred thirty-one".