111131423 has 16 divisors (see below), whose sum is σ = 125314560.
Its totient is φ = 97784544.
The previous prime is 111131369. The next prime is 111131429. The reversal of 111131423 is 324131111.
It is not a de Polignac number, because 111131423 - 222 = 106937119 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 (111131429) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132038 + ... + 132876.
It is an arithmetic number, because the mean of its divisors is an integer number (7832160).
Almost surely, 2111131423 is an apocalyptic number.
111131423 is a gapful number since it is divisible by the number (13) formed by its first and last digit.
111131423 is a deficient number, since it is larger than the sum of its proper divisors (14183137).
111131423 is a wasteful number, since it uses less digits than its factorization.
111131423 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1318.
The product of its digits is 72, while the sum is 17.
The square root of 111131423 is about 10541.8889673531.
Note that the first 3 decimals coincide.
The cubic root of 111131423 is about 480.7791497972.
Adding to 111131423 its reverse (324131111), we get a palindrome (435262534).
The spelling of 111131423 in words is "one hundred eleven million, one hundred thirty-one thousand, four hundred twenty-three".