1200111985 has 4 divisors (see below), whose sum is σ = 1440134388. Its totient is φ = 960089584.

The previous prime is 1200111977. The next prime is 1200112003. The reversal of 1200111985 is 5891110021.

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 730783089 + 469328896 = 27033^2 + 21664^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200111985 - 2³ = 1200111977 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, 120011194 + ... + 120011203.

It is an arithmetic number, because the mean of its divisors is an integer number (360033597).

Almost surely, 2^1200111985 is an apocalyptic number.

It is an amenable number.

1200111985 is a deficient number, since it is larger than the sum of its proper divisors (240022403).

1200111985 is an equidigital number, since it uses as much as digits as its factorization.

1200111985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240022402.

The product of its (nonzero) digits is 720, while the sum is 28.

The square root of 1200111985 is about 34642.6324779166. The cubic root of 1200111985 is about 1062.6916242155.

The spelling of 1200111985 in words is "one billion, two hundred million, one hundred eleven thousand, nine hundred eighty-five".