1100019985 has 4 divisors (see below), whose sum is σ = 1320023988. Its totient is φ = 880015984.

The previous prime is 1100019961. The next prime is 1100020021. The reversal of 1100019985 is 5899100011.

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 590344209 + 509675776 = 24297^2 + 22576^2 .

It is a cyclic number.

It is not a de Polignac number, because 1100019985 - 2¹³ = 1100011793 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 1100019985.

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, 110001994 + ... + 110002003.

It is an arithmetic number, because the mean of its divisors is an integer number (330005997).

Almost surely, 2^1100019985 is an apocalyptic number.

It is an amenable number.

1100019985 is a deficient number, since it is larger than the sum of its proper divisors (220004003).

1100019985 is an equidigital number, since it uses as much as digits as its factorization.

1100019985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220004002.

The product of its (nonzero) digits is 3240, while the sum is 34.

The square root of 1100019985 is about 33166.5491873966. The cubic root of 1100019985 is about 1032.2863669694.

Adding to 1100019985 its reverse (5899100011), we get a palindrome (6999119996).

The spelling of 1100019985 in words is "one billion, one hundred million, nineteen thousand, nine hundred eighty-five".