12309691 has 4 divisors (see below), whose sum is σ = 12349584. Its totient is φ = 12269800.

The previous prime is 12309637. The next prime is 12309707. The reversal of 12309691 is 19690321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12309691 - 2⁹ = 12309179 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12309631) 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, 19480 + ... + 20101.

It is an arithmetic number, because the mean of its divisors is an integer number (3087396).

Almost surely, 2^12309691 is an apocalyptic number.

12309691 is a deficient number, since it is larger than the sum of its proper divisors (39893).

12309691 is an equidigital number, since it uses as much as digits as its factorization.

12309691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39892.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 12309691 is about 3508.5169231457. The cubic root of 12309691 is about 230.8956319691.

The spelling of 12309691 in words is "twelve million, three hundred nine thousand, six hundred ninety-one".