31523320553442 has 16 divisors (see below), whose sum is σ = 63329361473280. Its totient is φ = 10460653456752.

The previous prime is 31523320553407. The next prime is 31523320553447. The reversal of 31523320553442 is 24435502332513.

It is a junction number, because it is equal to n+sod(n) for n = 31523320553394 and 31523320553403.

It is not an unprimeable number, because it can be changed into a prime (31523320553447) 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, 11780013817 + ... + 11780016492.

It is an arithmetic number, because the mean of its divisors is an integer number (3958085092080).

Almost surely, 2^{31523320553442} is an apocalyptic number.

31523320553442 is an abundant number, since it is smaller than the sum of its proper divisors (31806040919838).

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

31523320553442 is a wasteful number, since it uses less digits than its factorization.

31523320553442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23560030537.

The product of its (nonzero) digits is 1296000, while the sum is 42.

Adding to 31523320553442 its reverse (24435502332513), we get a palindrome (55958822885955).

The spelling of 31523320553442 in words is "thirty-one trillion, five hundred twenty-three billion, three hundred twenty million, five hundred fifty-three thousand, four hundred forty-two".