111540231 has 12 divisors (see below), whose sum is σ = 175760520. Its totient is φ = 67600080.

The previous prime is 111540211. The next prime is 111540251. The reversal of 111540231 is 132045111.

It is an interprime number because it is at equal distance from previous prime (111540211) and next prime (111540251).

It is not a de Polignac number, because 111540231 - 2⁵ = 111540199 is a prime.

It is a super-2 number, since 2×111540231² = 24882446263066722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111540211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 563236 + ... + 563433.

It is an arithmetic number, because the mean of its divisors is an integer number (14646710).

Almost surely, 2^111540231 is an apocalyptic number.

111540231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111540231 is a deficient number, since it is larger than the sum of its proper divisors (64220289).

111540231 is a wasteful number, since it uses less digits than its factorization.

111540231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1126686 (or 1126683 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 111540231 is about 10561.2608622266. The cubic root of 111540231 is about 481.3679597053.

Adding to 111540231 its reverse (132045111), we get a palindrome (243585342).

The spelling of 111540231 in words is "one hundred eleven million, five hundred forty thousand, two hundred thirty-one".