872117286121 has 2 divisors, whose sum is σ = 872117286122. Its totient is φ = 872117286120.

The previous prime is 872117286119. The next prime is 872117286163. The reversal of 872117286121 is 121682711278.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 621276580521 + 250840705600 = 788211^2 + 500840^2 .

It is a cyclic number.

It is not a de Polignac number, because 872117286121 - 2¹ = 872117286119 is a prime.

Together with 872117286119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (872117280121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 436058643060 + 436058643061.

It is an arithmetic number, because the mean of its divisors is an integer number (436058643061).

Almost surely, 2^872117286121 is an apocalyptic number.

It is an amenable number.

872117286121 is a deficient number, since it is larger than the sum of its proper divisors (1).

872117286121 is an equidigital number, since it uses as much as digits as its factorization.

872117286121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150528, while the sum is 46.

Adding to 872117286121 its reverse (121682711278), we get a palindrome (993799997399).

The spelling of 872117286121 in words is "eight hundred seventy-two billion, one hundred seventeen million, two hundred eighty-six thousand, one hundred twenty-one".