13220989 has 2 divisors, whose sum is σ = 13220990. Its totient is φ = 13220988.

The previous prime is 13220971. The next prime is 13220993. The reversal of 13220989 is 98902231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8008900 + 5212089 = 2830^2 + 2283^2 .

It is a cyclic number.

It is not a de Polignac number, because 13220989 - 2¹⁵ = 13188221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13224989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6610494 + 6610495.

It is an arithmetic number, because the mean of its divisors is an integer number (6610495).

Almost surely, 2^13220989 is an apocalyptic number.

It is an amenable number.

13220989 is a deficient number, since it is larger than the sum of its proper divisors (1).

13220989 is an equidigital number, since it uses as much as digits as its factorization.

13220989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 13220989 is about 3636.0677936474. The cubic root of 13220989 is about 236.4583462973.

The spelling of 13220989 in words is "thirteen million, two hundred twenty thousand, nine hundred eighty-nine".