871453638521 has 2 divisors, whose sum is σ = 871453638522. Its totient is φ = 871453638520.

The previous prime is 871453638437. The next prime is 871453638533. The reversal of 871453638521 is 125836354178.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 765266292025 + 106187346496 = 874795^2 + 325864^2 .

It is a cyclic number.

It is not a de Polignac number, because 871453638521 - 2³⁰ = 870379896697 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (871453638571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435726819260 + 435726819261.

It is an arithmetic number, because the mean of its divisors is an integer number (435726819261).

Almost surely, 2^871453638521 is an apocalyptic number.

It is an amenable number.

871453638521 is a deficient number, since it is larger than the sum of its proper divisors (1).

871453638521 is an equidigital number, since it uses as much as digits as its factorization.

871453638521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4838400, while the sum is 53.

The spelling of 871453638521 in words is "eight hundred seventy-one billion, four hundred fifty-three million, six hundred thirty-eight thousand, five hundred twenty-one".