111211998 has 8 divisors (see below), whose sum is σ = 222424008. Its totient is φ = 37070664.

The previous prime is 111211987. The next prime is 111211999. The reversal of 111211998 is 899112111.

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

111211998 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111211999) 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, 9267661 + ... + 9267672.

It is an arithmetic number, because the mean of its divisors is an integer number (27803001).

Almost surely, 2^111211998 is an apocalyptic number.

111211998 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

111211998 is a wasteful number, since it uses less digits than its factorization.

111211998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18535338.

The product of its digits is 1296, while the sum is 33.

The square root of 111211998 is about 10545.7099334279. The cubic root of 111211998 is about 480.8953168251.

The spelling of 111211998 in words is "one hundred eleven million, two hundred eleven thousand, nine hundred ninety-eight".