12891575 has 6 divisors (see below), whose sum is σ = 15985584. Its totient is φ = 10313240.

The previous prime is 12891553. The next prime is 12891587. The reversal of 12891575 is 57519821.

It is a de Polignac number, because none of the positive numbers 2^k-12891575 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 257807 + ... + 257856.

It is an arithmetic number, because the mean of its divisors is an integer number (2664264).

Almost surely, 2^12891575 is an apocalyptic number.

12891575 is a deficient number, since it is larger than the sum of its proper divisors (3094009).

12891575 is an equidigital number, since it uses as much as digits as its factorization.

12891575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515673 (or 515668 counting only the distinct ones).

The product of its digits is 25200, while the sum is 38.

The square root of 12891575 is about 3590.4839506674. The cubic root of 12891575 is about 234.4779417425.

The spelling of 12891575 in words is "twelve million, eight hundred ninety-one thousand, five hundred seventy-five".