111891128 has 8 divisors (see below), whose sum is σ = 209795880. Its totient is φ = 55945560.

The previous prime is 111891119. The next prime is 111891163. The reversal of 111891128 is 821198111.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×111891128² = 25039249050224768, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 111891094 and 111891103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6993188 + ... + 6993203.

It is an arithmetic number, because the mean of its divisors is an integer number (26224485).

Almost surely, 2^111891128 is an apocalyptic number.

It is an amenable number.

111891128 is a deficient number, since it is larger than the sum of its proper divisors (97904752).

111891128 is a wasteful number, since it uses less digits than its factorization.

111891128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13986397 (or 13986393 counting only the distinct ones).

The product of its digits is 1152, while the sum is 32.

The square root of 111891128 is about 10577.8602751218. The cubic root of 111891128 is about 481.8722135033.

The spelling of 111891128 in words is "one hundred eleven million, eight hundred ninety-one thousand, one hundred twenty-eight".