31581352242 has 48 divisors (see below), whose sum is σ = 74693979360. Its totient is φ = 9564062400.

The previous prime is 31581352241. The next prime is 31581352259. The reversal of 31581352242 is 24225318513.

31581352242 is a `hidden beast` number, since 3 + 1 + 581 + 3 + 52 + 24 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 31581352197 and 31581352206.

It is not an unprimeable number, because it can be changed into a prime (31581352241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 269017 + ... + 368147.

It is an arithmetic number, because the mean of its divisors is an integer number (1556124570).

Almost surely, 2^31581352242 is an apocalyptic number.

31581352242 is an abundant number, since it is smaller than the sum of its proper divisors (43112627118).

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

31581352242 is a wasteful number, since it uses less digits than its factorization.

31581352242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100759 (or 100756 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The spelling of 31581352242 in words is "thirty-one billion, five hundred eighty-one million, three hundred fifty-two thousand, two hundred forty-two".