13256009 has 4 divisors (see below), whose sum is σ = 14275716. Its totient is φ = 12236304.

The previous prime is 13255999. The next prime is 13256029. The reversal of 13256009 is 90065231.

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 5161984 + 8094025 = 2272^2 + 2845^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13256009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13256029) 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, 509834 + ... + 509859.

It is an arithmetic number, because the mean of its divisors is an integer number (3568929).

Almost surely, 2^13256009 is an apocalyptic number.

It is an amenable number.

13256009 is a deficient number, since it is larger than the sum of its proper divisors (1019707).

13256009 is a wasteful number, since it uses less digits than its factorization.

13256009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1019706.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 13256009 is about 3640.8802507086. The cubic root of 13256009 is about 236.6669406420. Note that the first 3 decimals are identical.

The spelling of 13256009 in words is "thirteen million, two hundred fifty-six thousand, nine".