11111989 has 8 divisors (see below), whose sum is σ = 12781568. Its totient is φ = 9462960.

The previous prime is 11111983. The next prime is 11111993. The reversal of 11111989 is 98911111.

11111989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11111989 - 2¹¹ = 11109941 is a prime.

It is a super-2 number, since 2×11111989² = 246952599072242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11111989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3957 + ... + 6154.

It is an arithmetic number, because the mean of its divisors is an integer number (1597696).

Almost surely, 2^11111989 is an apocalyptic number.

It is an amenable number.

11111989 is a deficient number, since it is larger than the sum of its proper divisors (1669579).

11111989 is a wasteful number, since it uses less digits than its factorization.

11111989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10275.

The product of its digits is 648, while the sum is 31.

The square root of 11111989 is about 3333.4650140657. The cubic root of 11111989 is about 223.1501934168.

It can be divided in two parts, 11111 and 989, that added together give a square (12100 = 110²).

The spelling of 11111989 in words is "eleven million, one hundred eleven thousand, nine hundred eighty-nine".