12689231 has 4 divisors (see below), whose sum is σ = 12730872. Its totient is φ = 12647592.

The previous prime is 12689219. The next prime is 12689233. The reversal of 12689231 is 13298621.

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 12689231 - 2⁶ = 12689167 is a prime.

It is a super-2 number, since 2×12689231² = 322033166742722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12689233) 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, 20360 + ... + 20973.

It is an arithmetic number, because the mean of its divisors is an integer number (3182718).

Almost surely, 2^12689231 is an apocalyptic number.

12689231 is a deficient number, since it is larger than the sum of its proper divisors (41641).

12689231 is an equidigital number, since it uses as much as digits as its factorization.

12689231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41640.

The product of its digits is 5184, while the sum is 32.

The square root of 12689231 is about 3562.1946886716. The cubic root of 12689231 is about 233.2446912729.

The spelling of 12689231 in words is "twelve million, six hundred eighty-nine thousand, two hundred thirty-one".