111981042 has 20 divisors (see below), whose sum is σ = 250920846. Its totient is φ = 37326960.

The previous prime is 111981019. The next prime is 111981059. The reversal of 111981042 is 240189111.

It can be written as a sum of positive squares in only one way, i.e., 101425041 + 10556001 = 10071^2 + 3249^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 111980997 and 111981015.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 345459 + ... + 345782.

Almost surely, 2^111981042 is an apocalyptic number.

111981042 is an abundant number, since it is smaller than the sum of its proper divisors (138939804).

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

111981042 is an equidigital number, since it uses as much as digits as its factorization.

111981042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691255 (or 691246 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The square root of 111981042 is about 10582.1095250427. The cubic root of 111981042 is about 482.0012539926.

The spelling of 111981042 in words is "one hundred eleven million, nine hundred eighty-one thousand, forty-two".