111991022 has 32 divisors (see below), whose sum is σ = 199360224. Its totient is φ = 46512000.

The previous prime is 111991001. The next prime is 111991051. The reversal of 111991022 is 220199111.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a junction number, because it is equal to n+sod(n) for n = 111990982 and 111991000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26948 + ... + 30824.

It is an arithmetic number, because the mean of its divisors is an integer number (6230007).

Almost surely, 2^111991022 is an apocalyptic number.

111991022 is a deficient number, since it is larger than the sum of its proper divisors (87369202).

111991022 is a wasteful number, since it uses less digits than its factorization.

111991022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4004.

The product of its (nonzero) digits is 324, while the sum is 26.

The square root of 111991022 is about 10582.5810651277. The cubic root of 111991022 is about 482.0155725758.

It can be divided in two parts, 11199 and 1022, that added together give a palindrome (12221).

The spelling of 111991022 in words is "one hundred eleven million, nine hundred ninety-one thousand, twenty-two".