12891613 has 4 divisors (see below), whose sum is σ = 14733280. Its totient is φ = 11049948.

The previous prime is 12891607. The next prime is 12891623. The reversal of 12891613 is 31619821.

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 12891613 - 2²¹ = 10794461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12891623) 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, 920823 + ... + 920836.

It is an arithmetic number, because the mean of its divisors is an integer number (3683320).

Almost surely, 2^12891613 is an apocalyptic number.

It is an amenable number.

12891613 is a deficient number, since it is larger than the sum of its proper divisors (1841667).

12891613 is an equidigital number, since it uses as much as digits as its factorization.

12891613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1841666.

The product of its digits is 2592, while the sum is 31.

The square root of 12891613 is about 3590.4892424292. The cubic root of 12891613 is about 234.4781721294.

The spelling of 12891613 in words is "twelve million, eight hundred ninety-one thousand, six hundred thirteen".