111231403542 has 72 divisors (see below), whose sum is σ = 282312337008. Its totient is φ = 31005210240.

The previous prime is 111231403523. The next prime is 111231403553. The reversal of 111231403542 is 245304132111.

111231403542 is a `hidden beast` number, since 1 + 112 + 3 + 1 + 4 + 0 + 3 + 542 = 666.

111231403542 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 50773 + ... + 474384.

Almost surely, 2^111231403542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 111231403542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141156168504).

111231403542 is an abundant number, since it is smaller than the sum of its proper divisors (171080933466).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

111231403542 is a wasteful number, since it uses less digits than its factorization.

111231403542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525254 (or 525210 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

Adding to 111231403542 its reverse (245304132111), we get a palindrome (356535535653).

The spelling of 111231403542 in words is "one hundred eleven billion, two hundred thirty-one million, four hundred three thousand, five hundred forty-two".