111442431 has 4 divisors (see below), whose sum is σ = 148589912. Its totient is φ = 74294952.

The previous prime is 111442417. The next prime is 111442459. The reversal of 111442431 is 134244111.

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

It is not a de Polignac number, because 111442431 - 2⁵ = 111442399 is a prime.

It is a super-2 number, since 2×111442431² = 24838830854379522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111442398 and 111442407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111442481) 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, 18573736 + ... + 18573741.

It is an arithmetic number, because the mean of its divisors is an integer number (37147478).

Almost surely, 2^111442431 is an apocalyptic number.

111442431 is a deficient number, since it is larger than the sum of its proper divisors (37147481).

111442431 is an equidigital number, since it uses as much as digits as its factorization.

111442431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37147480.

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

The square root of 111442431 is about 10556.6297178598. The cubic root of 111442431 is about 481.2272285622.

Adding to 111442431 its reverse (134244111), we get a palindrome (245686542).

The spelling of 111442431 in words is "one hundred eleven million, four hundred forty-two thousand, four hundred thirty-one".