111995999 has 8 divisors (see below), whose sum is σ = 116640000. Its totient is φ = 107404192.

The previous prime is 111995959. The next prime is 111996007. The reversal of 111995999 is 999599111.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111995999 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 111995999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111995959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8639 + ... + 17280.

It is an arithmetic number, because the mean of its divisors is an integer number (14580000).

Almost surely, 2^111995999 is an apocalyptic number.

111995999 is a deficient number, since it is larger than the sum of its proper divisors (4644001).

111995999 is a wasteful number, since it uses less digits than its factorization.

111995999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26097.

The product of its digits is 295245, while the sum is 53.

The square root of 111995999 is about 10582.8162130881. The cubic root of 111995999 is about 482.0227128981.

The spelling of 111995999 in words is "one hundred eleven million, nine hundred ninety-five thousand, nine hundred ninety-nine".