2291999 has 2 divisors, whose sum is σ = 2292000.
Its totient is φ = 2291998.
The previous prime is 2291987. The next prime is 2292001. The reversal of 2291999 is 9991922.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 2291999 - 24 = 2291983 is a prime.
Together with 2292001, 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 (2291909) 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, 1145999 + 1146000.
It is an arithmetic number, because the mean of its divisors is an integer number (1146000).
22291999 is an apocalyptic number.
2291999 is a deficient number, since it is larger than the sum of its proper divisors (1).
2291999 is an equidigital number, since it uses as much as digits as its factorization.
2291999 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 26244, while the sum is 41.
The square root of 2291999 is about 1513.9349391569.
The cubic root of 2291999 is about 131.8473710303.
The spelling of 2291999 in words is "two million, two hundred ninety-one thousand, nine hundred ninety-nine".