31553105521 has 12 divisors (see below), whose sum is σ = 37169253120. Its totient is φ = 26703167400.

The previous prime is 31553105483. The next prime is 31553105539. The reversal of 31553105521 is 12550135513.

It is not a de Polignac number, because 31553105521 - 2⁹ = 31553105009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31553115521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4071705 + ... + 4079446.

It is an arithmetic number, because the mean of its divisors is an integer number (3097437760).

Almost surely, 2^31553105521 is an apocalyptic number.

It is an amenable number.

31553105521 is a deficient number, since it is larger than the sum of its proper divisors (5616147599).

31553105521 is an equidigital number, since it uses as much as digits as its factorization.

31553105521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8151244 (or 8151237 counting only the distinct ones).

The product of its (nonzero) digits is 11250, while the sum is 31.

The spelling of 31553105521 in words is "thirty-one billion, five hundred fifty-three million, one hundred five thousand, five hundred twenty-one".