42431111 has 4 divisors (see below), whose sum is σ = 43231752. Its totient is φ = 41630472.

The previous prime is 42431101. The next prime is 42431117. The reversal of 42431111 is 11113424.

It is a happy number.

42431111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42431111 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 42431111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42431117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 400241 + ... + 400346.

It is an arithmetic number, because the mean of its divisors is an integer number (10807938).

Almost surely, 2^42431111 is an apocalyptic number.

42431111 is a deficient number, since it is larger than the sum of its proper divisors (800641).

42431111 is an equidigital number, since it uses as much as digits as its factorization.

42431111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800640.

The product of its digits is 96, while the sum is 17.

The square root of 42431111 is about 6513.9167173061. The cubic root of 42431111 is about 348.7879462657.

Adding to 42431111 its reverse (11113424), we get a palindrome (53544535).

The spelling of 42431111 in words is "forty-two million, four hundred thirty-one thousand, one hundred eleven".