12816989 has 2 divisors, whose sum is σ = 12816990. Its totient is φ = 12816988.

The previous prime is 12816977. The next prime is 12817027. The reversal of 12816989 is 98961821.

12816989 is digitally balanced in base 2 and base 3, because in such bases 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., 6416089 + 6400900 = 2533^2 + 2530^2 .

It is a cyclic number.

It is not a de Polignac number, because 12816989 - 2¹² = 12812893 is a prime.

It is a super-2 number, since 2×12816989² = 328550414052242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12816949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6408494 + 6408495.

It is an arithmetic number, because the mean of its divisors is an integer number (6408495).

Almost surely, 2^12816989 is an apocalyptic number.

It is an amenable number.

12816989 is a deficient number, since it is larger than the sum of its proper divisors (1).

12816989 is an equidigital number, since it uses as much as digits as its factorization.

12816989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 44.

The square root of 12816989 is about 3580.0822616247. The cubic root of 12816989 is about 234.0248652565.

The spelling of 12816989 in words is "twelve million, eight hundred sixteen thousand, nine hundred eighty-nine".