12731897 has 4 divisors (see below), whose sum is σ = 12739920. Its totient is φ = 12723876.

The previous prime is 12731893. The next prime is 12731909. The reversal of 12731897 is 79813721.

12731897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 79813721 = 13 ⋅6139517.

It is a cyclic number.

It is not a de Polignac number, because 12731897 - 2² = 12731893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12731897.

It is not an unprimeable number, because it can be changed into a prime (12731891) 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, 743 + ... + 5100.

It is an arithmetic number, because the mean of its divisors is an integer number (3184980).

Almost surely, 2^12731897 is an apocalyptic number.

It is an amenable number.

12731897 is a deficient number, since it is larger than the sum of its proper divisors (8023).

12731897 is an equidigital number, since it uses as much as digits as its factorization.

12731897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8022.

The product of its digits is 21168, while the sum is 38.

The square root of 12731897 is about 3568.1783867963. The cubic root of 12731897 is about 233.5058178162.

The spelling of 12731897 in words is "twelve million, seven hundred thirty-one thousand, eight hundred ninety-seven".