317842628221 has 4 divisors (see below), whose sum is σ = 317888190972. Its totient is φ = 317797065472.

The previous prime is 317842628167. The next prime is 317842628231. The reversal of 317842628221 is 122826248713.

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 22086120996 + 295756507225 = 148614^2 + 543835^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-317842628221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (317842628231) 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, 22770910 + ... + 22784863.

It is an arithmetic number, because the mean of its divisors is an integer number (79472047743).

Almost surely, 2^317842628221 is an apocalyptic number.

It is an amenable number.

317842628221 is a deficient number, since it is larger than the sum of its proper divisors (45562751).

317842628221 is an equidigital number, since it uses as much as digits as its factorization.

317842628221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45562750.

The product of its digits is 516096, while the sum is 46.

The spelling of 317842628221 in words is "three hundred seventeen billion, eight hundred forty-two million, six hundred twenty-eight thousand, two hundred twenty-one".