2490209 has 2 divisors, whose sum is σ = 2490210. Its totient is φ = 2490208.

The previous prime is 2490161. The next prime is 2490221. The reversal of 2490209 is 9020942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2411809 + 78400 = 1553^2 + 280^2 .

It is a cyclic number.

It is not a de Polignac number, because 2490209 - 2²⁰ = 1441633 is a prime.

It is a super-2 number, since 2×2490209² = 12402281727362, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2490239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1245104 + 1245105.

It is an arithmetic number, because the mean of its divisors is an integer number (1245105).

2^2490209 is an apocalyptic number.

It is an amenable number.

2490209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2490209 is an equidigital number, since it uses as much as digits as its factorization.

2490209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 2490209 is about 1578.0396066005. The cubic root of 2490209 is about 135.5434699379.

The spelling of 2490209 in words is "two million, four hundred ninety thousand, two hundred nine".