2291909 has 2 divisors, whose sum is σ = 2291910. Its totient is φ = 2291908.

The previous prime is 2291903. The next prime is 2291911. The reversal of 2291909 is 9091922.

2291909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2044900 + 247009 = 1430^2 + 497^2 .

It is a cyclic number.

It is not a de Polignac number, because 2291909 - 2⁴ = 2291893 is a prime.

Together with 2291911, 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 (2291903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1145954 + 1145955.

It is an arithmetic number, because the mean of its divisors is an integer number (1145955).

2^2291909 is an apocalyptic number.

It is an amenable number.

2291909 is a deficient number, since it is larger than the sum of its proper divisors (1).

2291909 is an equidigital number, since it uses as much as digits as its factorization.

2291909 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 2291909 is about 1513.9052149986. The cubic root of 2291909 is about 131.8456452561.

The spelling of 2291909 in words is "two million, two hundred ninety-one thousand, nine hundred nine".