111981967 has 4 divisors (see below), whose sum is σ = 112004440. Its totient is φ = 111959496.

The previous prime is 111981949. The next prime is 111981973. The reversal of 111981967 is 769189111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111981967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111981997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48 + ... + 14965.

It is an arithmetic number, because the mean of its divisors is an integer number (28001110).

Almost surely, 2^111981967 is an apocalyptic number.

111981967 is a deficient number, since it is larger than the sum of its proper divisors (22473).

111981967 is an equidigital number, since it uses as much as digits as its factorization.

111981967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22472.

The product of its digits is 27216, while the sum is 43.

The square root of 111981967 is about 10582.1532307938. The cubic root of 111981967 is about 482.0025811516.

The spelling of 111981967 in words is "one hundred eleven million, nine hundred eighty-one thousand, nine hundred sixty-seven".