12591897 has 4 divisors (see below), whose sum is σ = 16789200. Its totient is φ = 8394596.

The previous prime is 12591893. The next prime is 12591907. The reversal of 12591897 is 79819521.

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, and also an emirpimes, since its reverse is a distinct semiprime: 79819521 = 3 ⋅26606507.

It is a cyclic number.

It is not a de Polignac number, because 12591897 - 2² = 12591893 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12591893) 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, 2098647 + ... + 2098652.

It is an arithmetic number, because the mean of its divisors is an integer number (4197300).

Almost surely, 2^12591897 is an apocalyptic number.

It is an amenable number.

12591897 is a deficient number, since it is larger than the sum of its proper divisors (4197303).

12591897 is an equidigital number, since it uses as much as digits as its factorization.

12591897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4197302.

The product of its digits is 45360, while the sum is 42.

The square root of 12591897 is about 3548.5063054756. The cubic root of 12591897 is about 232.6467844066.

The spelling of 12591897 in words is "twelve million, five hundred ninety-one thousand, eight hundred ninety-seven".