311013231320 has 128 divisors (see below), whose sum is σ = 809508893760. Its totient is φ = 106284072960.

The previous prime is 311013231317. The next prime is 311013231323. The reversal of 311013231320 is 23132310113.

It is an interprime number because it is at equal distance from previous prime (311013231317) and next prime (311013231323).

It is a super-2 number, since 2×311013231320² (a number of 24 digits) contains 22 as substring.

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 = 311013231292 and 311013231301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311013231323) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5033252 + ... + 5094668.

Almost surely, 2^311013231320 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 311013231320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (404754446880).

311013231320 is an abundant number, since it is smaller than the sum of its proper divisors (498495662440).

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

311013231320 is a wasteful number, since it uses less digits than its factorization.

311013231320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62133 (or 62129 counting only the distinct ones).

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

Adding to 311013231320 its reverse (23132310113), we get a palindrome (334145541433).

The spelling of 311013231320 in words is "three hundred eleven billion, thirteen million, two hundred thirty-one thousand, three hundred twenty".