2311143985 has 4 divisors (see below), whose sum is σ = 2773372788. Its totient is φ = 1848915184.

The previous prime is 2311143959. The next prime is 2311143997. The reversal of 2311143985 is 5893411132.

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 716579361 + 1594564624 = 26769^2 + 39932^2 .

It is a cyclic number.

It is not a de Polignac number, because 2311143985 - 2¹³ = 2311135793 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231114394 + ... + 231114403.

It is an arithmetic number, because the mean of its divisors is an integer number (693343197).

Almost surely, 2^2311143985 is an apocalyptic number.

It is an amenable number.

2311143985 is a deficient number, since it is larger than the sum of its proper divisors (462228803).

2311143985 is an equidigital number, since it uses as much as digits as its factorization.

2311143985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462228802.

The product of its digits is 25920, while the sum is 37.

The square root of 2311143985 is about 48074.3589140823. The cubic root of 2311143985 is about 1322.1345905314.

The spelling of 2311143985 in words is "two billion, three hundred eleven million, one hundred forty-three thousand, nine hundred eighty-five".