2490809 has 2 divisors, whose sum is σ = 2490810. Its totient is φ = 2490808.

The previous prime is 2490769. The next prime is 2490811. The reversal of 2490809 is 9080942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2334784 + 156025 = 1528^2 + 395^2 .

It is a cyclic number.

It is not a de Polignac number, because 2490809 - 2¹² = 2486713 is a prime.

Together with 2490811, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2490869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1245404 + 1245405.

It is an arithmetic number, because the mean of its divisors is an integer number (1245405).

2^2490809 is an apocalyptic number.

It is an amenable number.

2490809 is a deficient number, since it is larger than the sum of its proper divisors (1).

2490809 is an equidigital number, since it uses as much as digits as its factorization.

2490809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 2490809 is about 1578.2297044474. The cubic root of 2490809 is about 135.5543551757.

The spelling of 2490809 in words is "two million, four hundred ninety thousand, eight hundred nine".