2409509 has 2 divisors, whose sum is σ = 2409510. Its totient is φ = 2409508.

The previous prime is 2409493. The next prime is 2409541. The reversal of 2409509 is 9059042.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2316484 + 93025 = 1522^2 + 305^2 .

It is a cyclic number.

It is not a de Polignac number, because 2409509 - 2⁴ = 2409493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2409559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1204754 + 1204755.

It is an arithmetic number, because the mean of its divisors is an integer number (1204755).

2^2409509 is an apocalyptic number.

It is an amenable number.

2409509 is a deficient number, since it is larger than the sum of its proper divisors (1).

2409509 is an equidigital number, since it uses as much as digits as its factorization.

2409509 is an evil number, because the sum of its binary digits is even.

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

The square root of 2409509 is about 1552.2593211187. The cubic root of 2409509 is about 134.0631802752.

The spelling of 2409509 in words is "two million, four hundred nine thousand, five hundred nine".