12491669 has 4 divisors (see below), whose sum is σ = 12667680. Its totient is φ = 12315660.

The previous prime is 12491627. The next prime is 12491693. The reversal of 12491669 is 96619421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12491669 - 2²⁰ = 11443093 is a prime.

It is a super-2 number, since 2×12491669² = 312083588811122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12491069) 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, 87899 + ... + 88040.

It is an arithmetic number, because the mean of its divisors is an integer number (3166920).

Almost surely, 2^12491669 is an apocalyptic number.

It is an amenable number.

12491669 is a deficient number, since it is larger than the sum of its proper divisors (176011).

12491669 is an equidigital number, since it uses as much as digits as its factorization.

12491669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176010.

The product of its digits is 23328, while the sum is 38.

The square root of 12491669 is about 3534.3555282399. The cubic root of 12491669 is about 232.0278714533.

The spelling of 12491669 in words is "twelve million, four hundred ninety-one thousand, six hundred sixty-nine".