31551205450242 has 32 divisors (see below), whose sum is σ = 63137111118912. Its totient is φ = 10511286715584.

The previous prime is 31551205450217. The next prime is 31551205450273. The reversal of 31551205450242 is 24205450215513.

It is a self number, because there is not a number n which added to its sum of digits gives 31551205450242.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 80054328 + ... + 80447484.

It is an arithmetic number, because the mean of its divisors is an integer number (1973034722466).

Almost surely, 2^{31551205450242} is an apocalyptic number.

31551205450242 is an abundant number, since it is smaller than the sum of its proper divisors (31585905668670).

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

31551205450242 is a wasteful number, since it uses less digits than its factorization.

31551205450242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400482.

The product of its (nonzero) digits is 240000, while the sum is 39.

Adding to 31551205450242 its reverse (24205450215513), we get a palindrome (55756655665755).

The spelling of 31551205450242 in words is "thirty-one trillion, five hundred fifty-one billion, two hundred five million, four hundred fifty thousand, two hundred forty-two".