12951997897 has 4 divisors (see below), whose sum is σ = 12967436160. Its totient is φ = 12936559636.

The previous prime is 12951997829. The next prime is 12951997901. The reversal of 12951997897 is 79879915921.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12951997897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12951997397) 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, 7717873 + ... + 7719550.

It is an arithmetic number, because the mean of its divisors is an integer number (3241859040).

Almost surely, 2^12951997897 is an apocalyptic number.

It is an amenable number.

12951997897 is a deficient number, since it is larger than the sum of its proper divisors (15438263).

12951997897 is an equidigital number, since it uses as much as digits as its factorization.

12951997897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15438262.

The product of its digits is 25719120, while the sum is 67.

The spelling of 12951997897 in words is "twelve billion, nine hundred fifty-one million, nine hundred ninety-seven thousand, eight hundred ninety-seven".