111981197 has 8 divisors (see below), whose sum is σ = 114353976. Its totient is φ = 109631232.

The previous prime is 111981173. The next prime is 111981211. The reversal of 111981197 is 791189111.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11600836 + 100380361 = 3406^2 + 10019^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 111981197 - 2²² = 107786893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111981197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111981137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4403 + ... + 15599.

It is an arithmetic number, because the mean of its divisors is an integer number (14294247).

Almost surely, 2^111981197 is an apocalyptic number.

It is an amenable number.

111981197 is a deficient number, since it is larger than the sum of its proper divisors (2372779).

111981197 is a wasteful number, since it uses less digits than its factorization.

111981197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11407.

The product of its digits is 4536, while the sum is 38.

The square root of 111981197 is about 10582.1168487217. The cubic root of 111981197 is about 482.0014763819.

The spelling of 111981197 in words is "one hundred eleven million, nine hundred eighty-one thousand, one hundred ninety-seven".