12979121 has 4 divisors (see below), whose sum is σ = 13012212. Its totient is φ = 12946032.

The previous prime is 12979103. The next prime is 12979123. The reversal of 12979121 is 12197921.

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 3591025 + 9388096 = 1895^2 + 3064^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12979121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12979123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15950 + ... + 16743.

It is an arithmetic number, because the mean of its divisors is an integer number (3253053).

Almost surely, 2^12979121 is an apocalyptic number.

It is an amenable number.

12979121 is a deficient number, since it is larger than the sum of its proper divisors (33091).

12979121 is an equidigital number, since it uses as much as digits as its factorization.

12979121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33090.

The product of its digits is 2268, while the sum is 32.

The square root of 12979121 is about 3602.6547156229. The cubic root of 12979121 is about 235.0075205078.

The spelling of 12979121 in words is "twelve million, nine hundred seventy-nine thousand, one hundred twenty-one".