111543523431 has 4 divisors (see below), whose sum is σ = 148724697912. Its totient is φ = 74362348952.

The previous prime is 111543523379. The next prime is 111543523433. The reversal of 111543523431 is 134325345111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134325345111 = 3 ⋅44775115037.

It is a cyclic number.

It is not a de Polignac number, because 111543523431 - 2⁹ = 111543522919 is a prime.

It is a super-2 number, since 2×111543523431² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 111543523392 and 111543523401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111543523433) 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, 18590587236 + ... + 18590587241.

It is an arithmetic number, because the mean of its divisors is an integer number (37181174478).

Almost surely, 2^111543523431 is an apocalyptic number.

111543523431 is a deficient number, since it is larger than the sum of its proper divisors (37181174481).

111543523431 is an equidigital number, since it uses as much as digits as its factorization.

111543523431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37181174480.

The product of its digits is 21600, while the sum is 33.

Adding to 111543523431 its reverse (134325345111), we get a palindrome (245868868542).

The spelling of 111543523431 in words is "one hundred eleven billion, five hundred forty-three million, five hundred twenty-three thousand, four hundred thirty-one".