100011985 has 4 divisors (see below), whose sum is σ = 120014388. Its totient is φ = 80009584.

The previous prime is 100011979. The next prime is 100012019. The reversal of 100011985 is 589110001.

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 73479184 + 26532801 = 8572^2 + 5151^2 .

It is a cyclic number.

It is not a de Polignac number, because 100011985 - 2²⁵ = 66457553 is a prime.

It is a Duffinian 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, 10001194 + ... + 10001203.

It is an arithmetic number, because the mean of its divisors is an integer number (30003597).

Almost surely, 2^100011985 is an apocalyptic number.

It is an amenable number.

100011985 is a deficient number, since it is larger than the sum of its proper divisors (20002403).

100011985 is an equidigital number, since it uses as much as digits as its factorization.

100011985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20002402.

The product of its (nonzero) digits is 360, while the sum is 25.

The square root of 100011985 is about 10000.5992320460. The cubic root of 100011985 is about 464.1774257679.

Adding to 100011985 its reverse (589110001), we get a palindrome (689121986).

The spelling of 100011985 in words is "one hundred million, eleven thousand, nine hundred eighty-five".