31313321422540 has 48 divisors (see below), whose sum is σ = 65944316325888. Its totient is φ = 12489849520064.

The previous prime is 31313321422499. The next prime is 31313321422597. The reversal of 31313321422540 is 4522412331313.

It is a super-2 number, since 2×31313321422540² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31313321422496 and 31313321422505.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34194279 + ... + 35098081.

It is an arithmetic number, because the mean of its divisors is an integer number (1373839923456).

Almost surely, 2^{31313321422540} is an apocalyptic number.

It is an amenable number.

31313321422540 is an abundant number, since it is smaller than the sum of its proper divisors (34630994903348).

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

31313321422540 is a wasteful number, since it uses less digits than its factorization.

31313321422540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908718 (or 908716 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 34.

Adding to 31313321422540 its reverse (4522412331313), we get a palindrome (35835733753853).

The spelling of 31313321422540 in words is "thirty-one trillion, three hundred thirteen billion, three hundred twenty-one million, four hundred twenty-two thousand, five hundred forty".