311223214165 has 4 divisors (see below), whose sum is σ = 373467857004. Its totient is φ = 248978571328.

The previous prime is 311223214073. The next prime is 311223214171. The reversal of 311223214165 is 561412322113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 561412322113 = 317 ⋅1771016789.

It can be written as a sum of positive squares in 2 ways, for example, as 248361692881 + 62861521284 = 498359^2 + 250722^2 .

It is a cyclic number.

It is not a de Polignac number, because 311223214165 - 2²³ = 311214825557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31122321412 + ... + 31122321421.

It is an arithmetic number, because the mean of its divisors is an integer number (93366964251).

Almost surely, 2^311223214165 is an apocalyptic number.

It is an amenable number.

311223214165 is a deficient number, since it is larger than the sum of its proper divisors (62244642839).

311223214165 is an equidigital number, since it uses as much as digits as its factorization.

311223214165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62244642838.

The product of its digits is 8640, while the sum is 31.

Adding to 311223214165 its reverse (561412322113), we get a palindrome (872635536278).

The spelling of 311223214165 in words is "three hundred eleven billion, two hundred twenty-three million, two hundred fourteen thousand, one hundred sixty-five".