111993859 has 4 divisors (see below), whose sum is σ = 113892120. Its totient is φ = 110095600.

The previous prime is 111993821. The next prime is 111993949. The reversal of 111993859 is 958399111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 958399111 = 20897 ⋅45863.

It is a cyclic number.

It is not a de Polignac number, because 111993859 - 2⁹ = 111993347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111913859) 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, 949042 + ... + 949159.

It is an arithmetic number, because the mean of its divisors is an integer number (28473030).

Almost surely, 2^111993859 is an apocalyptic number.

111993859 is a deficient number, since it is larger than the sum of its proper divisors (1898261).

111993859 is an equidigital number, since it uses as much as digits as its factorization.

111993859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1898260.

The product of its digits is 87480, while the sum is 46.

The square root of 111993859 is about 10582.7151053026. The cubic root of 111993859 is about 482.0196427433.

The spelling of 111993859 in words is "one hundred eleven million, nine hundred ninety-three thousand, eight hundred fifty-nine".