311431220152 has 64 divisors (see below), whose sum is σ = 649280136960. Its totient is φ = 139070131200.

The previous prime is 311431220141. The next prime is 311431220153. The reversal of 311431220152 is 251022134113.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311431220153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21119502 + ... + 21134242.

It is an arithmetic number, because the mean of its divisors is an integer number (10145002140).

Almost surely, 2^311431220152 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 311431220152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (324640068480).

311431220152 is an abundant number, since it is smaller than the sum of its proper divisors (337848916808).

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

311431220152 is a wasteful number, since it uses less digits than its factorization.

311431220152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21344 (or 21340 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 311431220152 its reverse (251022134113), we get a palindrome (562453354265).

The spelling of 311431220152 in words is "three hundred eleven billion, four hundred thirty-one million, two hundred twenty thousand, one hundred fifty-two".