2045909 has 2 divisors, whose sum is σ = 2045910. Its totient is φ = 2045908.

The previous prime is 2045903. The next prime is 2045929. The reversal of 2045909 is 9095402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1697809 + 348100 = 1303^2 + 590^2 .

It is a cyclic number.

It is not a de Polignac number, because 2045909 - 2⁸ = 2045653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2045903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1022954 + 1022955.

It is an arithmetic number, because the mean of its divisors is an integer number (1022955).

2^2045909 is an apocalyptic number.

It is an amenable number.

2045909 is a deficient number, since it is larger than the sum of its proper divisors (1).

2045909 is an equidigital number, since it uses as much as digits as its factorization.

2045909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 2045909 is about 1430.3527536940. The cubic root of 2045909 is about 126.9488499662.

The spelling of 2045909 in words is "two million, forty-five thousand, nine hundred nine".