12309479909 has 4 divisors (see below), whose sum is σ = 12310103916. Its totient is φ = 12308855904.

The previous prime is 12309479887. The next prime is 12309479957. The reversal of 12309479909 is 90997490321.

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 9752155009 + 2557324900 = 98753^2 + 50570^2 .

It is a cyclic number.

It is not a de Polignac number, because 12309479909 - 2²⁸ = 12041044453 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 (12309479989) 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, 281414 + ... + 322199.

It is an arithmetic number, because the mean of its divisors is an integer number (3077525979).

Almost surely, 2^12309479909 is an apocalyptic number.

It is an amenable number.

12309479909 is a deficient number, since it is larger than the sum of its proper divisors (624007).

12309479909 is an equidigital number, since it uses as much as digits as its factorization.

12309479909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624006.

The product of its (nonzero) digits is 1102248, while the sum is 53.

The spelling of 12309479909 in words is "twelve billion, three hundred nine million, four hundred seventy-nine thousand, nine hundred nine".