111720606 has 8 divisors (see below), whose sum is σ = 223441224. Its totient is φ = 37240200.

The previous prime is 111720601. The next prime is 111720641. The reversal of 111720606 is 606027111.

It is a sphenic number, since it is the product of 3 distinct primes.

111720606 is an admirable number.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111720601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9310045 + ... + 9310056.

It is an arithmetic number, because the mean of its divisors is an integer number (27930153).

Almost surely, 2^111720606 is an apocalyptic number.

111720606 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

111720606 is a wasteful number, since it uses less digits than its factorization.

111720606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18620106.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 111720606 is about 10569.7968760048. The cubic root of 111720606 is about 481.6272980732.

Adding to 111720606 its reverse (606027111), we get a palindrome (717747717).

The spelling of 111720606 in words is "one hundred eleven million, seven hundred twenty thousand, six hundred six".