111242143 has 4 divisors (see below), whose sum is σ = 113955408. Its totient is φ = 108528880.

The previous prime is 111242141. The next prime is 111242213. The reversal of 111242143 is 341242111.

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

It is a cyclic number.

It is not a de Polignac number, because 111242143 - 2¹ = 111242141 is a prime.

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 111242143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111242141) 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, 1356571 + ... + 1356652.

It is an arithmetic number, because the mean of its divisors is an integer number (28488852).

Almost surely, 2^111242143 is an apocalyptic number.

111242143 is a deficient number, since it is larger than the sum of its proper divisors (2713265).

111242143 is an equidigital number, since it uses as much as digits as its factorization.

111242143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2713264.

The product of its digits is 192, while the sum is 19.

The square root of 111242143 is about 10547.1390907677. The cubic root of 111242143 is about 480.9387632157.

Adding to 111242143 its reverse (341242111), we get a palindrome (452484254).

The spelling of 111242143 in words is "one hundred eleven million, two hundred forty-two thousand, one hundred forty-three".