2231909 has 2 divisors, whose sum is σ = 2231910. Its totient is φ = 2231908.

The previous prime is 2231891. The next prime is 2231941. The reversal of 2231909 is 9091322.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1329409 + 902500 = 1153^2 + 950^2 .

It is a cyclic number.

It is not a de Polignac number, because 2231909 - 2⁸ = 2231653 is a prime.

It is a super-3 number, since 3×2231909³ = 33354213556490467287, which contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2231209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1115954 + 1115955.

It is an arithmetic number, because the mean of its divisors is an integer number (1115955).

2^2231909 is an apocalyptic number.

It is an amenable number.

2231909 is a deficient number, since it is larger than the sum of its proper divisors (1).

2231909 is an equidigital number, since it uses as much as digits as its factorization.

2231909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 2231909 is about 1493.9574960487. The cubic root of 2231909 is about 130.6849254588.

The spelling of 2231909 in words is "two million, two hundred thirty-one thousand, nine hundred nine".