31845821305 has 4 divisors (see below), whose sum is σ = 38214985572. Its totient is φ = 25476657040.

The previous prime is 31845821303. The next prime is 31845821311. The reversal of 31845821305 is 50312854813.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20940405264 + 10905416041 = 144708^2 + 104429^2 .

It is not a de Polignac number, because 31845821305 - 2¹ = 31845821303 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31845821303) 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 3 ways as a sum of consecutive naturals, for example, 3184582126 + ... + 3184582135.

It is an arithmetic number, because the mean of its divisors is an integer number (9553746393).

Almost surely, 2^31845821305 is an apocalyptic number.

It is an amenable number.

31845821305 is a deficient number, since it is larger than the sum of its proper divisors (6369164267).

31845821305 is an equidigital number, since it uses as much as digits as its factorization.

31845821305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6369164266.

The product of its (nonzero) digits is 115200, while the sum is 40.

The spelling of 31845821305 in words is "thirty-one billion, eight hundred forty-five million, eight hundred twenty-one thousand, three hundred five".