13157009 has 4 divisors (see below), whose sum is σ = 13337316. Its totient is φ = 12976704.

The previous prime is 13156999. The next prime is 13157017. The reversal of 13157009 is 90075131.

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 7006609 + 6150400 = 2647^2 + 2480^2 .

It is a cyclic number.

It is not a de Polignac number, because 13157009 - 2⁴ = 13156993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13150009) 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, 90044 + ... + 90189.

It is an arithmetic number, because the mean of its divisors is an integer number (3334329).

Almost surely, 2^13157009 is an apocalyptic number.

It is an amenable number.

13157009 is a deficient number, since it is larger than the sum of its proper divisors (180307).

13157009 is an equidigital number, since it uses as much as digits as its factorization.

13157009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180306.

The product of its (nonzero) digits is 945, while the sum is 26.

The square root of 13157009 is about 3627.2591580972. The cubic root of 13157009 is about 236.0763003792.

The spelling of 13157009 in words is "thirteen million, one hundred fifty-seven thousand, nine".