13156009 has 2 divisors, whose sum is σ = 13156010. Its totient is φ = 13156008.

The previous prime is 13156007. The next prime is 13156019. The reversal of 13156009 is 90065131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10989225 + 2166784 = 3315^2 + 1472^2 .

It is a cyclic number.

It is not a de Polignac number, because 13156009 - 2¹ = 13156007 is a prime.

Together with 13156007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (13156001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6578004 + 6578005.

It is an arithmetic number, because the mean of its divisors is an integer number (6578005).

Almost surely, 2^13156009 is an apocalyptic number.

It is an amenable number.

13156009 is a deficient number, since it is larger than the sum of its proper divisors (1).

13156009 is an equidigital number, since it uses as much as digits as its factorization.

13156009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 810, while the sum is 25.

The square root of 13156009 is about 3627.1213103507. The cubic root of 13156009 is about 236.0703192254.

It can be divided in two parts, 1315600 and 9, that added together give a square (1315609 = 1147²).

The spelling of 13156009 in words is "thirteen million, one hundred fifty-six thousand, nine".