11211989 has 2 divisors, whose sum is σ = 11211990. Its totient is φ = 11211988.

The previous prime is 11211961. The next prime is 11212001. The reversal of 11211989 is 98911211.

11211989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6589489 + 4622500 = 2567^2 + 2150^2 .

It is a cyclic number.

It is not a de Polignac number, because 11211989 - 2¹² = 11207893 is a prime.

It is a super-3 number, since 3×11211989³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11211289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605994 + 5605995.

It is an arithmetic number, because the mean of its divisors is an integer number (5605995).

Almost surely, 2^11211989 is an apocalyptic number.

It is an amenable number.

11211989 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211989 is an equidigital number, since it uses as much as digits as its factorization.

11211989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 32.

The square root of 11211989 is about 3348.4308265216. The cubic root of 11211989 is about 223.8175930530.

The spelling of 11211989 in words is "eleven million, two hundred eleven thousand, nine hundred eighty-nine".