311223021985 has 8 divisors (see below), whose sum is σ = 373478262696. Its totient is φ = 248971326720.

The previous prime is 311223021953. The next prime is 311223022021. The reversal of 311223021985 is 589120322113.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 62736723729 + 248486298256 = 250473^2 + 498484^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 311223021985 - 2⁵ = 311223021953 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 689256 + ... + 1047625.

It is an arithmetic number, because the mean of its divisors is an integer number (46684782837).

Almost surely, 2^311223021985 is an apocalyptic number.

It is an amenable number.

311223021985 is a deficient number, since it is larger than the sum of its proper divisors (62255240711).

311223021985 is a wasteful number, since it uses less digits than its factorization.

311223021985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1772723.

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

The spelling of 311223021985 in words is "three hundred eleven billion, two hundred twenty-three million, twenty-one thousand, nine hundred eighty-five".