111688642 has 8 divisors (see below), whose sum is σ = 180420156. Its totient is φ = 51548592.

The previous prime is 111688637. The next prime is 111688651. The reversal of 111688642 is 246886111.

It can be written as a sum of positive squares in 2 ways, for example, as 90611361 + 21077281 = 9519^2 + 4591^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2147833 + ... + 2147884.

Almost surely, 2^111688642 is an apocalyptic number.

111688642 is a deficient number, since it is larger than the sum of its proper divisors (68731514).

111688642 is a wasteful number, since it uses less digits than its factorization.

111688642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4295732.

The product of its digits is 18432, while the sum is 37.

The square root of 111688642 is about 10568.2847236437. The cubic root of 111688642 is about 481.5813614463.

The spelling of 111688642 in words is "one hundred eleven million, six hundred eighty-eight thousand, six hundred forty-two".