311123111020 has 48 divisors (see below), whose sum is σ = 702378754560. Its totient is φ = 115390782144.

The previous prime is 311123111017. The next prime is 311123111023. The reversal of 311123111020 is 20111321113.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (311123111017) and next prime (311123111023).

It is a junction number, because it is equal to n+sod(n) for n = 311123110985 and 311123111003.

It is not an unprimeable number, because it can be changed into a prime (311123111023) 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 15 ways as a sum of consecutive naturals, for example, 8692194 + ... + 8727913.

It is an arithmetic number, because the mean of its divisors is an integer number (14632890720).

Almost surely, 2^311123111020 is an apocalyptic number.

It is an amenable number.

311123111020 is an abundant number, since it is smaller than the sum of its proper divisors (391255643540).

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

311123111020 is a wasteful number, since it uses less digits than its factorization.

311123111020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17420182 (or 17420180 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 311123111020 its reverse (20111321113), we get a palindrome (331234432133).

The spelling of 311123111020 in words is "three hundred eleven billion, one hundred twenty-three million, one hundred eleven thousand, twenty".