111123540 has 72 divisors (see below), whose sum is σ = 367724448. Its totient is φ = 26938560.

The previous prime is 111123539. The next prime is 111123541. The reversal of 111123540 is 45321111.

111123540 is a `hidden beast` number, since 1 + 1 + 1 + 123 + 540 = 666.

It is an interprime number because it is at equal distance from previous prime (111123539) and next prime (111123541).

It is a super-2 number, since 2×111123540² = 24696882284263200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111123541) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26082 + ... + 30041.

It is an arithmetic number, because the mean of its divisors is an integer number (5107284).

Almost surely, 2^111123540 is an apocalyptic number.

111123540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111123540 is an abundant number, since it is smaller than the sum of its proper divisors (256600908).

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

111123540 is a wasteful number, since it uses less digits than its factorization.

111123540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56149 (or 56144 counting only the distinct ones).

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

The square root of 111123540 is about 10541.5150713738. The cubic root of 111123540 is about 480.7677816605.

Adding to 111123540 its reverse (45321111), we get a palindrome (156444651).

The spelling of 111123540 in words is "one hundred eleven million, one hundred twenty-three thousand, five hundred forty".