111131998 has 8 divisors (see below), whose sum is σ = 173945808. Its totient is φ = 53150064.

The previous prime is 111131981. The next prime is 111132001. The reversal of 111131998 is 899131111.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1207911 + ... + 1208002.

It is an arithmetic number, because the mean of its divisors is an integer number (21743226).

Almost surely, 2^111131998 is an apocalyptic number.

111131998 is a deficient number, since it is larger than the sum of its proper divisors (62813810).

111131998 is a wasteful number, since it uses less digits than its factorization.

111131998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2415938.

The product of its digits is 1944, while the sum is 34.

The square root of 111131998 is about 10541.9162394699. The cubic root of 111131998 is about 480.7799789883.

The spelling of 111131998 in words is "one hundred eleven million, one hundred thirty-one thousand, nine hundred ninety-eight".