111289 has 4 divisors (see below), whose sum is σ = 112420. Its totient is φ = 110160.

The previous prime is 111271. The next prime is 111301. The reversal of 111289 is 982111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71289 + 40000 = 267^2 + 200^2 .

It is a cyclic number.

It is not a de Polignac number, because 111289 - 2⁹ = 110777 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (111229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 402 + ... + 619.

It is an arithmetic number, because the mean of its divisors is an integer number (28105).

2¹¹¹²⁸⁹ is an apocalyptic number.

It is an amenable number.

111289 is a deficient number, since it is larger than the sum of its proper divisors (1131).

111289 is a wasteful number, since it uses less digits than its factorization.

111289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130.

The product of its digits is 144, while the sum is 22.

The square root of 111289 is about 333.6000599520. The cubic root of 111289 is about 48.1006280147.

It can be divided in two parts, 111 and 289, that added together give a square (400 = 20²).

The spelling of 111289 in words is "one hundred eleven thousand, two hundred eighty-nine".