1000111985 has 4 divisors (see below), whose sum is σ = 1200134388. Its totient is φ = 800089584.

The previous prime is 1000111979. The next prime is 1000111997. The reversal of 1000111985 is 5891110001.

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 669308641 + 330803344 = 25871^2 + 18188^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000111985 - 2¹⁶ = 1000046449 is a prime.

It is a Duffinian number.

It is a Curzon 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, 100011194 + ... + 100011203.

It is an arithmetic number, because the mean of its divisors is an integer number (300033597).

Almost surely, 2^1000111985 is an apocalyptic number.

It is an amenable number.

1000111985 is a deficient number, since it is larger than the sum of its proper divisors (200022403).

1000111985 is an equidigital number, since it uses as much as digits as its factorization.

1000111985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200022402.

The product of its (nonzero) digits is 360, while the sum is 26.

The square root of 1000111985 is about 31624.5471904342. The cubic root of 1000111985 is about 1000.0373269400.

Adding to 1000111985 its reverse (5891110001), we get a palindrome (6891221986).

The spelling of 1000111985 in words is "one billion, one hundred eleven thousand, nine hundred eighty-five".