12665491 has 8 divisors (see below), whose sum is σ = 12930224. Its totient is φ = 12402720.

The previous prime is 12665467. The next prime is 12665509. The reversal of 12665491 is 19456621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12665491 - 2⁷ = 12665363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12665441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23956 + ... + 24478.

It is an arithmetic number, because the mean of its divisors is an integer number (1616278).

Almost surely, 2^12665491 is an apocalyptic number.

12665491 is a deficient number, since it is larger than the sum of its proper divisors (264733).

12665491 is an equidigital number, since it uses as much as digits as its factorization.

12665491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981.

The product of its digits is 12960, while the sum is 34.

The square root of 12665491 is about 3558.8609132699. The cubic root of 12665491 is about 233.0991430328.

The spelling of 12665491 in words is "twelve million, six hundred sixty-five thousand, four hundred ninety-one".