2290991 has 2 divisors, whose sum is σ = 2290992. Its totient is φ = 2290990.

The previous prime is 2290987. The next prime is 2290999. The reversal of 2290991 is 1990922.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2290991 - 2² = 2290987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2290999) 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, 1145495 + 1145496.

It is an arithmetic number, because the mean of its divisors is an integer number (1145496).

2^2290991 is an apocalyptic number.

2290991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2290991 is an equidigital number, since it uses as much as digits as its factorization.

2290991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 2290991 is about 1513.6019952418. The cubic root of 2290991 is about 131.8280397773.

The spelling of 2290991 in words is "two million, two hundred ninety thousand, nine hundred ninety-one".