871031764180861 has 2 divisors, whose sum is σ = 871031764180862. Its totient is φ = 871031764180860.

The previous prime is 871031764180819. The next prime is 871031764180871. The reversal of 871031764180861 is 168081467130178.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 799357439868100 + 71674324312761 = 28272910^2 + 8466069^2 .

It is a cyclic number.

It is not a de Polignac number, because 871031764180861 - 2²⁵ = 871031730626429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 871031764180861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (871031764180871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435515882090430 + 435515882090431.

It is an arithmetic number, because the mean of its divisors is an integer number (435515882090431).

Almost surely, 2^{871031764180861} is an apocalyptic number.

It is an amenable number.

871031764180861 is a deficient number, since it is larger than the sum of its proper divisors (1).

871031764180861 is an equidigital number, since it uses as much as digits as its factorization.

871031764180861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10838016, while the sum is 61.

The spelling of 871031764180861 in words is "eight hundred seventy-one trillion, thirty-one billion, seven hundred sixty-four million, one hundred eighty thousand, eight hundred sixty-one".