111812005 has 4 divisors (see below), whose sum is σ = 134174412. Its totient is φ = 89449600.

The previous prime is 111811967. The next prime is 111812053. The reversal of 111812005 is 500218111.

It is a happy number.

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 85248289 + 26563716 = 9233^2 + 5154^2 .

It is not a de Polignac number, because 111812005 - 2⁷ = 111811877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11181196 + ... + 11181205.

It is an arithmetic number, because the mean of its divisors is an integer number (33543603).

Almost surely, 2^111812005 is an apocalyptic number.

It is an amenable number.

111812005 is a deficient number, since it is larger than the sum of its proper divisors (22362407).

111812005 is an equidigital number, since it uses as much as digits as its factorization.

111812005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22362406.

The product of its (nonzero) digits is 80, while the sum is 19.

The square root of 111812005 is about 10574.1195851002. The cubic root of 111812005 is about 481.7586025719.

The spelling of 111812005 in words is "one hundred eleven million, eight hundred twelve thousand, five".