871705454621 has 2 divisors, whose sum is σ = 871705454622. Its totient is φ = 871705454620.

The previous prime is 871705454573. The next prime is 871705454623. The reversal of 871705454621 is 126454507178.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 587414944900 + 284290509721 = 766430^2 + 533189^2 .

It is a cyclic number.

It is not a de Polignac number, because 871705454621 - 2³⁸ = 596827547677 is a prime.

Together with 871705454623, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 871705454621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (871705454623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435852727310 + 435852727311.

It is an arithmetic number, because the mean of its divisors is an integer number (435852727311).

Almost surely, 2^871705454621 is an apocalyptic number.

It is an amenable number.

871705454621 is a deficient number, since it is larger than the sum of its proper divisors (1).

871705454621 is an equidigital number, since it uses as much as digits as its factorization.

871705454621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1881600, while the sum is 50.

The spelling of 871705454621 in words is "eight hundred seventy-one billion, seven hundred five million, four hundred fifty-four thousand, six hundred twenty-one".