1509009 has 4 divisors (see below), whose sum is σ = 2012016. Its totient is φ = 1006004.

The previous prime is 1508993. The next prime is 1509019. The reversal of 1509009 is 9009051.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9009051 = 3 ⋅3003017.

It is a cyclic number.

It is not a de Polignac number, because 1509009 - 2⁴ = 1508993 is a prime.

It is a D-number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1509009.

It is not an unprimeable number, because it can be changed into a prime (1509019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251499 + ... + 251504.

It is an arithmetic number, because the mean of its divisors is an integer number (503004).

2^1509009 is an apocalyptic number.

It is an amenable number.

1509009 is a deficient number, since it is larger than the sum of its proper divisors (503007).

1509009 is an equidigital number, since it uses as much as digits as its factorization.

1509009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503006.

The product of its (nonzero) digits is 405, while the sum is 24.

The square root of 1509009 is about 1228.4172743820. The cubic root of 1509009 is about 114.7001387695.

The spelling of 1509009 in words is "one million, five hundred nine thousand, nine".