111442143 has 4 divisors (see below), whose sum is σ = 148589528. Its totient is φ = 74294760.

The previous prime is 111442109. The next prime is 111442147. The reversal of 111442143 is 341244111.

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

It is not a de Polignac number, because 111442143 - 2¹⁶ = 111376607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111442147) 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, 18573688 + ... + 18573693.

It is an arithmetic number, because the mean of its divisors is an integer number (37147382).

Almost surely, 2^111442143 is an apocalyptic number.

111442143 is a deficient number, since it is larger than the sum of its proper divisors (37147385).

111442143 is an equidigital number, since it uses as much as digits as its factorization.

111442143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37147384.

The product of its digits is 384, while the sum is 21.

The square root of 111442143 is about 10556.6160771338. The cubic root of 111442143 is about 481.2268140176.

Adding to 111442143 its reverse (341244111), we get a palindrome (452686254).

The spelling of 111442143 in words is "one hundred eleven million, four hundred forty-two thousand, one hundred forty-three".