871648681 has 2 divisors, whose sum is σ = 871648682. Its totient is φ = 871648680.

The previous prime is 871648649. The next prime is 871648711. The reversal of 871648681 is 186846178.

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., 743053081 + 128595600 = 27259^2 + 11340^2 .

It is a cyclic number.

It is not a de Polignac number, because 871648681 - 2⁵ = 871648649 is a prime.

It is a super-2 number, since 2×871648681² = 1519542846178079522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (871640681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435824340 + 435824341.

It is an arithmetic number, because the mean of its divisors is an integer number (435824341).

Almost surely, 2^871648681 is an apocalyptic number.

It is an amenable number.

871648681 is a deficient number, since it is larger than the sum of its proper divisors (1).

871648681 is an equidigital number, since it uses as much as digits as its factorization.

871648681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 516096, while the sum is 49.

The square root of 871648681 is about 29523.6969399159. The cubic root of 871648681 is about 955.2429161945.

The spelling of 871648681 in words is "eight hundred seventy-one million, six hundred forty-eight thousand, six hundred eighty-one".