13056509 has 4 divisors (see below), whose sum is σ = 13104960. Its totient is φ = 13008060.

The previous prime is 13056499. The next prime is 13056541. The reversal of 13056509 is 90565031.

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: 90565031 = 149 ⋅607819.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13056509 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 (13056559) 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, 23819 + ... + 24360.

It is an arithmetic number, because the mean of its divisors is an integer number (3276240).

Almost surely, 2^13056509 is an apocalyptic number.

It is an amenable number.

13056509 is a deficient number, since it is larger than the sum of its proper divisors (48451).

13056509 is an equidigital number, since it uses as much as digits as its factorization.

13056509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48450.

The product of its (nonzero) digits is 4050, while the sum is 29.

The square root of 13056509 is about 3613.3791663760. The cubic root of 13056509 is about 235.4736726474.

The spelling of 13056509 in words is "thirteen million, fifty-six thousand, five hundred nine".