111691906 has 8 divisors (see below), whose sum is σ = 167868540. Its totient is φ = 55735728.

The previous prime is 111691903. The next prime is 111691907. The reversal of 111691906 is 609196111.

It can be written as a sum of positive squares in 2 ways, for example, as 106812225 + 4879681 = 10335^2 + 2209^2 .

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

It is not an unprimeable number, because it can be changed into a prime (111691901) 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, 53841 + ... + 55876.

Almost surely, 2^111691906 is an apocalyptic number.

111691906 is a deficient number, since it is larger than the sum of its proper divisors (56176634).

111691906 is a wasteful number, since it uses less digits than its factorization.

111691906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110228.

The product of its (nonzero) digits is 2916, while the sum is 34.

The square root of 111691906 is about 10568.4391468182. The cubic root of 111691906 is about 481.5860526612.

The spelling of 111691906 in words is "one hundred eleven million, six hundred ninety-one thousand, nine hundred six".