871057050428209 has 2 divisors, whose sum is σ = 871057050428210. Its totient is φ = 871057050428208.

The previous prime is 871057050428189. The next prime is 871057050428291. The reversal of 871057050428209 is 902824050750178.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 869931429160000 + 1125621268209 = 29494600^2 + 1060953^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-871057050428209 is a prime.

It is not a weakly prime, because it can be changed into another prime (871057050528209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435528525214104 + 435528525214105.

It is an arithmetic number, because the mean of its divisors is an integer number (435528525214105).

Almost surely, 2^{871057050428209} is an apocalyptic number.

It is an amenable number.

871057050428209 is a deficient number, since it is larger than the sum of its proper divisors (1).

871057050428209 is an equidigital number, since it uses as much as digits as its factorization.

871057050428209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11289600, while the sum is 58.

The spelling of 871057050428209 in words is "eight hundred seventy-one trillion, fifty-seven billion, fifty million, four hundred twenty-eight thousand, two hundred nine".