111598981 has 6 divisors (see below), whose sum is σ = 120844050. Its totient is φ = 103014288.

The previous prime is 111598979. The next prime is 111598997. The reversal of 111598981 is 189895111.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 401956 + 111197025 = 634^2 + 10545^2 .

It is not a de Polignac number, because 111598981 - 2¹ = 111598979 is a prime.

It is a super-2 number, since 2×111598981² = 24908665120476722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111590981) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 330006 + ... + 330343.

It is an arithmetic number, because the mean of its divisors is an integer number (20140675).

Almost surely, 2^111598981 is an apocalyptic number.

It is an amenable number.

111598981 is a deficient number, since it is larger than the sum of its proper divisors (9245069).

111598981 is an equidigital number, since it uses as much as digits as its factorization.

111598981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660375 (or 660362 counting only the distinct ones).

The product of its digits is 25920, while the sum is 43.

The square root of 111598981 is about 10564.0418874596. The cubic root of 111598981 is about 481.4524595717.

The spelling of 111598981 in words is "one hundred eleven million, five hundred ninety-eight thousand, nine hundred eighty-one".