10811989 has 2 divisors, whose sum is σ = 10811990. Its totient is φ = 10811988.

The previous prime is 10811923. The next prime is 10812023. The reversal of 10811989 is 98911801.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9199089 + 1612900 = 3033^2 + 1270^2 .

It is a cyclic number.

It is not a de Polignac number, because 10811989 - 2¹¹ = 10809941 is a prime.

It is a super-2 number, since 2×10811989² = 233798212272242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10811089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5405994 + 5405995.

It is an arithmetic number, because the mean of its divisors is an integer number (5405995).

Almost surely, 2^10811989 is an apocalyptic number.

It is an amenable number.

10811989 is a deficient number, since it is larger than the sum of its proper divisors (1).

10811989 is an equidigital number, since it uses as much as digits as its factorization.

10811989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 37.

The square root of 10811989 is about 3288.1589073523. The cubic root of 10811989 is about 221.1236519929.

The spelling of 10811989 in words is "ten million, eight hundred eleven thousand, nine hundred eighty-nine".