12897631 has 2 divisors, whose sum is σ = 12897632. Its totient is φ = 12897630.

The previous prime is 12897623. The next prime is 12897649. The reversal of 12897631 is 13679821.

It is a weak prime.

It is an emirp because it is prime and its reverse (13679821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12897631 - 2³ = 12897623 is a prime.

It is a super-2 number, since 2×12897631² = 332697770824322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12897331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6448815 + 6448816.

It is an arithmetic number, because the mean of its divisors is an integer number (6448816).

Almost surely, 2^12897631 is an apocalyptic number.

12897631 is a deficient number, since it is larger than the sum of its proper divisors (1).

12897631 is an equidigital number, since it uses as much as digits as its factorization.

12897631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 37.

The square root of 12897631 is about 3591.3271920002. The cubic root of 12897631 is about 234.5146524397.

The spelling of 12897631 in words is "twelve million, eight hundred ninety-seven thousand, six hundred thirty-one".