1309009 has 4 divisors (see below), whose sum is σ = 1409716. Its totient is φ = 1208304.

The previous prime is 1308977. The next prime is 1309013. The reversal of 1309009 is 9009031.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 278784 + 1030225 = 528^2 + 1015^2 .

It is a cyclic number.

It is not a de Polignac number, because 1309009 - 2⁵ = 1308977 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309039) 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, 50334 + ... + 50359.

It is an arithmetic number, because the mean of its divisors is an integer number (352429).

2^1309009 is an apocalyptic number.

It is an amenable number.

1309009 is a deficient number, since it is larger than the sum of its proper divisors (100707).

1309009 is a wasteful number, since it uses less digits than its factorization.

1309009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100706.

The product of its (nonzero) digits is 243, while the sum is 22.

The square root of 1309009 is about 1144.1193119601. The cubic root of 1309009 is about 109.3908199158.

Adding to 1309009 its sum of digits (22), we get a palindrome (1309031).

The spelling of 1309009 in words is "one million, three hundred nine thousand, nine".