111998851 has 4 divisors (see below), whose sum is σ = 112501312. Its totient is φ = 111496392.

The previous prime is 111998827. The next prime is 111998857. The reversal of 111998851 is 158899111.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 111998851 - 2⁷ = 111998723 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111998798 and 111998807.

It is not an unprimeable number, because it can be changed into a prime (111998857) 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, 250896 + ... + 251341.

It is an arithmetic number, because the mean of its divisors is an integer number (28125328).

Almost surely, 2^111998851 is an apocalyptic number.

111998851 is a deficient number, since it is larger than the sum of its proper divisors (502461).

111998851 is an equidigital number, since it uses as much as digits as its factorization.

111998851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502460.

The product of its digits is 25920, while the sum is 43.

The square root of 111998851 is about 10582.9509589717. The cubic root of 111998851 is about 482.0268044643.

The spelling of 111998851 in words is "one hundred eleven million, nine hundred ninety-eight thousand, eight hundred fifty-one".