31313420242540 has 24 divisors (see below), whose sum is σ = 69626310892992. Its totient is φ = 11788581738240.

The previous prime is 31313420242469. The next prime is 31313420242541. The reversal of 31313420242540 is 4524202431313.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 31313420242496 and 31313420242505.

It is not an unprimeable number, because it can be changed into a prime (31313420242541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46049147076 + ... + 46049147755.

It is an arithmetic number, because the mean of its divisors is an integer number (2901096287208).

Almost surely, 2^{31313420242540} is an apocalyptic number.

It is an amenable number.

31313420242540 is an abundant number, since it is smaller than the sum of its proper divisors (38312890650452).

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

31313420242540 is a wasteful number, since it uses less digits than its factorization.

31313420242540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92098294857 (or 92098294855 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 34.

Adding to 31313420242540 its reverse (4524202431313), we get a palindrome (35837622673853).

The spelling of 31313420242540 in words is "thirty-one trillion, three hundred thirteen billion, four hundred twenty million, two hundred forty-two thousand, five hundred forty".