111231998 has 8 divisors (see below), whose sum is σ = 169133808. Its totient is φ = 54854064.

The previous prime is 111231997. The next prime is 111232021. The reversal of 111231998 is 899132111.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111231997) 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, 380786 + ... + 381077.

It is an arithmetic number, because the mean of its divisors is an integer number (21141726).

Almost surely, 2^111231998 is an apocalyptic number.

111231998 is a deficient number, since it is larger than the sum of its proper divisors (57901810).

111231998 is an equidigital number, since it uses as much as digits as its factorization.

111231998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761938.

The product of its digits is 3888, while the sum is 35.

The square root of 111231998 is about 10546.6581436965. The cubic root of 111231998 is about 480.9241426413.

The spelling of 111231998 in words is "one hundred eleven million, two hundred thirty-one thousand, nine hundred ninety-eight".