311203122132 has 96 divisors (see below), whose sum is σ = 856322369280. Its totient is φ = 86113198080.

The previous prime is 311203122107. The next prime is 311203122143. The reversal of 311203122132 is 231221302113.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 311203122099 and 311203122108.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 142044 + ... + 801612.

It is an arithmetic number, because the mean of its divisors is an integer number (8920024680).

Almost surely, 2^311203122132 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 311203122132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (428161184640).

311203122132 is an abundant number, since it is smaller than the sum of its proper divisors (545119247148).

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

311203122132 is a wasteful number, since it uses less digits than its factorization.

311203122132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659761 (or 659759 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 311203122132 its reverse (231221302113), we get a palindrome (542424424245).

The spelling of 311203122132 in words is "three hundred eleven billion, two hundred three million, one hundred twenty-two thousand, one hundred thirty-two".