31323130000 has 100 divisors (see below), whose sum is σ = 76589755308. Its totient is φ = 12404800000.

The previous prime is 31323129979. The next prime is 31323130073. The reversal of 31323130000 is 3132313.

It can be written as a sum of positive squares in 10 ways, for example, as 26068039936 + 5255090064 = 161456^2 + 72492^2 .

It is a tau number, because it is divible by the number of its divisors (100).

It is a super-2 number, since 2×31323130000² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 994494 + ... + 1025506.

Almost surely, 2^31323130000 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 31323130000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38294877654).

31323130000 is an abundant number, since it is smaller than the sum of its proper divisors (45266625308).

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

31323130000 is a wasteful number, since it uses less digits than its factorization.

31323130000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31142 (or 31121 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 16.

Adding to 31323130000 its reverse (3132313), we get a palindrome (31326262313).

31323130000 divided by its reverse (3132313) gives a 4-th power (10000 = 10⁴).

The spelling of 31323130000 in words is "thirty-one billion, three hundred twenty-three million, one hundred thirty thousand".