111931668 has 18 divisors (see below), whose sum is σ = 282938474. Its totient is φ = 37310544.

The previous prime is 111931663. The next prime is 111931733. The reversal of 111931668 is 866139111.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 104898564 + 7033104 = 10242^2 + 2652^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 3109213 = 111931668 / (1 + 1 + 1 + 9 + 3 + 1 + 6 + 6 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111931661) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1554571 + ... + 1554642.

Almost surely, 2^111931668 is an apocalyptic number.

111931668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

111931668 is an abundant number, since it is smaller than the sum of its proper divisors (171006806).

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

111931668 is a wasteful number, since it uses less digits than its factorization.

111931668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3109223 (or 3109218 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 111931668 is about 10579.7763681469. The cubic root of 111931668 is about 481.9304032247.

The spelling of 111931668 in words is "one hundred eleven million, nine hundred thirty-one thousand, six hundred sixty-eight".