12131579 has 4 divisors (see below), whose sum is σ = 12140184. Its totient is φ = 12122976.

The previous prime is 12131573. The next prime is 12131621. The reversal of 12131579 is 97513121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12131579 - 2⁴ = 12131563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12131573) 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, 1637 + ... + 5190.

It is an arithmetic number, because the mean of its divisors is an integer number (3035046).

Almost surely, 2^12131579 is an apocalyptic number.

12131579 is a deficient number, since it is larger than the sum of its proper divisors (8605).

12131579 is an equidigital number, since it uses as much as digits as its factorization.

12131579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8604.

The product of its digits is 1890, while the sum is 29.

The square root of 12131579 is about 3483.0416305293. The cubic root of 12131579 is about 229.7765883513.

The spelling of 12131579 in words is "twelve million, one hundred thirty-one thousand, five hundred seventy-nine".