111145820 has 24 divisors (see below), whose sum is σ = 245691600. Its totient is φ = 42118272.

The previous prime is 111145807. The next prime is 111145829. The reversal of 111145820 is 28541111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111145829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145865 + ... + 146624.

It is an arithmetic number, because the mean of its divisors is an integer number (10237150).

Almost surely, 2^111145820 is an apocalyptic number.

111145820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111145820 is an abundant number, since it is smaller than the sum of its proper divisors (134545780).

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

111145820 is a wasteful number, since it uses less digits than its factorization.

111145820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292517 (or 292515 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 23.

The square root of 111145820 is about 10542.5717924992. The cubic root of 111145820 is about 480.7999104377.

Adding to 111145820 its reverse (28541111), we get a palindrome (139686931).

The spelling of 111145820 in words is "one hundred eleven million, one hundred forty-five thousand, eight hundred twenty".