111541138 has 4 divisors (see below), whose sum is σ = 167311710. Its totient is φ = 55770568.

The previous prime is 111541043. The next prime is 111541139. The reversal of 111541138 is 831145111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831145111 = 173 ⋅4804307.

It can be written as a sum of positive squares in only one way, i.e., 107391769 + 4149369 = 10363^2 + 2037^2 .

It is not an unprimeable number, because it can be changed into a prime (111541139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27885283 + ... + 27885286.

Almost surely, 2^111541138 is an apocalyptic number.

111541138 is a deficient number, since it is larger than the sum of its proper divisors (55770572).

111541138 is an equidigital number, since it uses as much as digits as its factorization.

111541138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55770571.

The product of its digits is 480, while the sum is 25.

The square root of 111541138 is about 10561.3038020881. The cubic root of 111541138 is about 481.3692644649.

Adding to 111541138 its reverse (831145111), we get a palindrome (942686249).

The spelling of 111541138 in words is "one hundred eleven million, five hundred forty-one thousand, one hundred thirty-eight".