13131709 has 4 divisors (see below), whose sum is σ = 13141440. Its totient is φ = 13121980.

The previous prime is 13131661. The next prime is 13131719. The reversal of 13131709 is 90713131.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 90713131 = 29 ⋅3128039.

It is a cyclic number.

It is not a de Polignac number, because 13131709 - 2⁷ = 13131581 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 (13131719) 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, 2437 + ... + 5674.

It is an arithmetic number, because the mean of its divisors is an integer number (3285360).

Almost surely, 2^13131709 is an apocalyptic number.

It is an amenable number.

13131709 is a deficient number, since it is larger than the sum of its proper divisors (9731).

13131709 is an equidigital number, since it uses as much as digits as its factorization.

13131709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9730.

The product of its (nonzero) digits is 567, while the sum is 25.

The square root of 13131709 is about 3623.7699982201. The cubic root of 13131709 is about 235.9248839270.

The spelling of 13131709 in words is "thirteen million, one hundred thirty-one thousand, seven hundred nine".