12979181309 has 4 divisors (see below), whose sum is σ = 12983940060. Its totient is φ = 12974422560.

The previous prime is 12979181269. The next prime is 12979181317. The reversal of 12979181309 is 90318197921.

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 8574204409 + 4404976900 = 92597^2 + 66370^2 .

It is a cyclic number.

It is not a de Polignac number, because 12979181309 - 2⁸ = 12979181053 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 (12979181389) 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, 2375282 + ... + 2380739.

It is an arithmetic number, because the mean of its divisors is an integer number (3245985015).

Almost surely, 2^12979181309 is an apocalyptic number.

It is an amenable number.

12979181309 is a deficient number, since it is larger than the sum of its proper divisors (4758751).

12979181309 is an equidigital number, since it uses as much as digits as its factorization.

12979181309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4758750.

The product of its (nonzero) digits is 244944, while the sum is 50.

The spelling of 12979181309 in words is "twelve billion, nine hundred seventy-nine million, one hundred eighty-one thousand, three hundred nine".