12217889 has 2 divisors, whose sum is σ = 12217890. Its totient is φ = 12217888.

The previous prime is 12217879. The next prime is 12217901. The reversal of 12217889 is 98871221.

12217889 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 can be written as a sum of positive squares in only one way, i.e., 10837264 + 1380625 = 3292^2 + 1175^2 .

It is a cyclic number.

It is not a de Polignac number, because 12217889 - 2¹² = 12213793 is a prime.

It is not a weakly prime, because it can be changed into another prime (12217859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6108944 + 6108945.

It is an arithmetic number, because the mean of its divisors is an integer number (6108945).

Almost surely, 2^12217889 is an apocalyptic number.

It is an amenable number.

12217889 is a deficient number, since it is larger than the sum of its proper divisors (1).

12217889 is an equidigital number, since it uses as much as digits as its factorization.

12217889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 38.

The square root of 12217889 is about 3495.4097041692. The cubic root of 12217889 is about 230.3202156013.

The spelling of 12217889 in words is "twelve million, two hundred seventeen thousand, eight hundred eighty-nine".