13156309 has 4 divisors (see below), whose sum is σ = 13170240. Its totient is φ = 13142380.

The previous prime is 13156289. The next prime is 13156327. The reversal of 13156309 is 90365131.

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: 90365131 = 29 ⋅3116039.

It is a cyclic number.

It is not a de Polignac number, because 13156309 - 2¹³ = 13148117 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 (13156009) 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, 5437 + ... + 7474.

It is an arithmetic number, because the mean of its divisors is an integer number (3292560).

Almost surely, 2^13156309 is an apocalyptic number.

It is an amenable number.

13156309 is a deficient number, since it is larger than the sum of its proper divisors (13931).

13156309 is a wasteful number, since it uses less digits than its factorization.

13156309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13930.

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 13156309 is about 3627.1626652247. The cubic root of 13156309 is about 236.0721136034.

The spelling of 13156309 in words is "thirteen million, one hundred fifty-six thousand, three hundred nine".