12691479 has 4 divisors (see below), whose sum is σ = 16921976. Its totient is φ = 8460984.

The previous prime is 12691451. The next prime is 12691501. The reversal of 12691479 is 97419621.

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

It is not a de Polignac number, because 12691479 - 2⁸ = 12691223 is a prime.

It is a super-2 number, since 2×12691479² = 322147278414882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12691079) 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, 2115244 + ... + 2115249.

It is an arithmetic number, because the mean of its divisors is an integer number (4230494).

Almost surely, 2^12691479 is an apocalyptic number.

12691479 is a deficient number, since it is larger than the sum of its proper divisors (4230497).

12691479 is an equidigital number, since it uses as much as digits as its factorization.

12691479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4230496.

The product of its digits is 27216, while the sum is 39.

The square root of 12691479 is about 3562.5102105117. The cubic root of 12691479 is about 233.2584641881.

The spelling of 12691479 in words is "twelve million, six hundred ninety-one thousand, four hundred seventy-nine".