311331230120 has 32 divisors (see below), whose sum is σ = 730951585920. Its totient is φ = 119118035520.

The previous prime is 311331230033. The next prime is 311331230129. The reversal of 311331230120 is 21032133113.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 311331230092 and 311331230101.

It is not an unprimeable number, because it can be changed into a prime (311331230129) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 169200836 + ... + 169202675.

It is an arithmetic number, because the mean of its divisors is an integer number (22842237060).

Almost surely, 2^311331230120 is an apocalyptic number.

It is an amenable number.

311331230120 is an abundant number, since it is smaller than the sum of its proper divisors (419620355800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

311331230120 is a wasteful number, since it uses less digits than its factorization.

311331230120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338403545 (or 338403541 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 311331230120 its reverse (21032133113), we get a palindrome (332363363233).

The spelling of 311331230120 in words is "three hundred eleven billion, three hundred thirty-one million, two hundred thirty thousand, one hundred twenty".