111812993 has 4 divisors (see below), whose sum is σ = 112100820. Its totient is φ = 111525168.

The previous prime is 111812983. The next prime is 111812999. The reversal of 111812993 is 399218111.

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

It can be written as a sum of positive squares in 2 ways, for example, as 68674369 + 43138624 = 8287^2 + 6568^2 .

It is a cyclic number.

It is not a de Polignac number, because 111812993 - 2¹² = 111808897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111812999) 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, 143330 + ... + 144107.

It is an arithmetic number, because the mean of its divisors is an integer number (28025205).

Almost surely, 2^111812993 is an apocalyptic number.

It is an amenable number.

111812993 is a deficient number, since it is larger than the sum of its proper divisors (287827).

111812993 is an equidigital number, since it uses as much as digits as its factorization.

111812993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287826.

The product of its digits is 3888, while the sum is 35.

The square root of 111812993 is about 10574.1663028345. The cubic root of 111812993 is about 481.7600215492.

The spelling of 111812993 in words is "one hundred eleven million, eight hundred twelve thousand, nine hundred ninety-three".