12897831 has 4 divisors (see below), whose sum is σ = 17197112. Its totient is φ = 8598552.

The previous prime is 12897817. The next prime is 12897839. The reversal of 12897831 is 13879821.

12897831 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.

It is not a de Polignac number, because 12897831 - 2¹⁵ = 12865063 is a prime.

It is a super-2 number, since 2×12897831² = 332708089009122, which contains 22 as substring.

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 12897831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12897839) 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, 2149636 + ... + 2149641.

It is an arithmetic number, because the mean of its divisors is an integer number (4299278).

Almost surely, 2^12897831 is an apocalyptic number.

12897831 is a deficient number, since it is larger than the sum of its proper divisors (4299281).

12897831 is an equidigital number, since it uses as much as digits as its factorization.

12897831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4299280.

The product of its digits is 24192, while the sum is 39.

The square root of 12897831 is about 3591.3550367514. The cubic root of 12897831 is about 234.5158646180.

The spelling of 12897831 in words is "twelve million, eight hundred ninety-seven thousand, eight hundred thirty-one".