10911989 has 4 divisors (see below), whose sum is σ = 11904000. Its totient is φ = 9919980.

The previous prime is 10911961. The next prime is 10911997. The reversal of 10911989 is 98911901.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98911901 = 11 ⋅8991991.

It is a cyclic number.

It is not a de Polignac number, because 10911989 - 2¹² = 10907893 is a prime.

It is a super-2 number, since 2×10911989² = 238143007872242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10911949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 495989 + ... + 496010.

It is an arithmetic number, because the mean of its divisors is an integer number (2976000).

Almost surely, 2^10911989 is an apocalyptic number.

It is an amenable number.

10911989 is a deficient number, since it is larger than the sum of its proper divisors (992011).

10911989 is an equidigital number, since it uses as much as digits as its factorization.

10911989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992010.

The product of its (nonzero) digits is 5832, while the sum is 38.

The square root of 10911989 is about 3303.3299865439. The cubic root of 10911989 is about 221.8032846052.

The spelling of 10911989 in words is "ten million, nine hundred eleven thousand, nine hundred eighty-nine".