31020311132320 has 48 divisors (see below), whose sum is σ = 75266173849608. Its totient is φ = 12072769735680.

The previous prime is 31020311132309. The next prime is 31020311132323. The reversal of 31020311132320 is 2323111302013.

It can be written as a sum of positive squares in 4 ways, for example, as 25966321552656 + 5053989579664 = 5095716^2 + 2248108^2 .

It is a super-2 number, since 2×31020311132320² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31020311132291 and 31020311132300.

It is not an unprimeable number, because it can be changed into a prime (31020311132323) 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 7 ways as a sum of consecutive naturals, for example, 2619952791 + ... + 2619964630.

Almost surely, 2^{31020311132320} is an apocalyptic number.

It is an amenable number.

31020311132320 is an abundant number, since it is smaller than the sum of its proper divisors (44245862717288).

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

31020311132320 is a wasteful number, since it uses less digits than its factorization.

31020311132320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5239917473 (or 5239917465 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 31020311132320 its reverse (2323111302013), we get a palindrome (33343422434333).

The spelling of 31020311132320 in words is "thirty-one trillion, twenty billion, three hundred eleven million, one hundred thirty-two thousand, three hundred twenty".