311123121232 has 320 divisors, whose sum is σ = 785877700608. Its totient is φ = 115831296000.

The previous prime is 311123121209. The next prime is 311123121233. The reversal of 311123121232 is 232121321113.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311123121233) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 680794348 + ... + 680794804.

Almost surely, 2^311123121232 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 311123121232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (392938850304).

311123121232 is an abundant number, since it is smaller than the sum of its proper divisors (474754579376).

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

311123121232 is a wasteful number, since it uses less digits than its factorization.

311123121232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778 (or 772 counting only the distinct ones).

The product of its digits is 432, while the sum is 22.

Adding to 311123121232 its reverse (232121321113), we get a palindrome (543244442345).

The spelling of 311123121232 in words is "three hundred eleven billion, one hundred twenty-three million, one hundred twenty-one thousand, two hundred thirty-two".