12897751 has 4 divisors (see below), whose sum is σ = 13576600. Its totient is φ = 12218904.

The previous prime is 12897697. The next prime is 12897761. The reversal of 12897751 is 15779821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12897751 - 2⁷ = 12897623 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 (12897761) 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, 339396 + ... + 339433.

It is an arithmetic number, because the mean of its divisors is an integer number (3394150).

Almost surely, 2^12897751 is an apocalyptic number.

12897751 is a deficient number, since it is larger than the sum of its proper divisors (678849).

12897751 is an equidigital number, since it uses as much as digits as its factorization.

12897751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678848.

The product of its digits is 35280, while the sum is 40.

The square root of 12897751 is about 3591.3438988769. The cubic root of 12897751 is about 234.5153797482.

It can be divided in two parts, 128 and 97751, that added together give a palindrome (97879).

The spelling of 12897751 in words is "twelve million, eight hundred ninety-seven thousand, seven hundred fifty-one".