12891223 has 2 divisors, whose sum is σ = 12891224. Its totient is φ = 12891222.

The previous prime is 12891217. The next prime is 12891233. The reversal of 12891223 is 32219821.

12891223 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12891223 - 2⁹ = 12890711 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12891191 and 12891200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12891233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6445611 + 6445612.

It is an arithmetic number, because the mean of its divisors is an integer number (6445612).

Almost surely, 2^12891223 is an apocalyptic number.

12891223 is a deficient number, since it is larger than the sum of its proper divisors (1).

12891223 is an equidigital number, since it uses as much as digits as its factorization.

12891223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 28.

The square root of 12891223 is about 3590.4349318711. The cubic root of 12891223 is about 234.4758076100.

The spelling of 12891223 in words is "twelve million, eight hundred ninety-one thousand, two hundred twenty-three".