2040431209 has 2 divisors, whose sum is σ = 2040431210. Its totient is φ = 2040431208.

The previous prime is 2040431143. The next prime is 2040431219. The reversal of 2040431209 is 9021340402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1596402025 + 444029184 = 39955^2 + 21072^2 .

It is a cyclic number.

It is not a de Polignac number, because 2040431209 - 2¹¹ = 2040429161 is a prime.

It is a super-2 number, since 2×2040431209² = 8326719037322403362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2040431219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1020215604 + 1020215605.

It is an arithmetic number, because the mean of its divisors is an integer number (1020215605).

Almost surely, 2^2040431209 is an apocalyptic number.

It is an amenable number.

2040431209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2040431209 is an equidigital number, since it uses as much as digits as its factorization.

2040431209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 2040431209 is about 45171.1324741809. The cubic root of 2040431209 is about 1268.3544954585.

The spelling of 2040431209 in words is "two billion, forty million, four hundred thirty-one thousand, two hundred nine".