71086817 has 2 divisors, whose sum is σ = 71086818. Its totient is φ = 71086816.

The previous prime is 71086793. The next prime is 71086819. The reversal of 71086817 is 71868017.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55413136 + 15673681 = 7444^2 + 3959^2 .

It is a cyclic number.

It is not a de Polignac number, because 71086817 - 2⁶ = 71086753 is a prime.

Together with 71086819, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71086819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35543408 + 35543409.

It is an arithmetic number, because the mean of its divisors is an integer number (35543409).

Almost surely, 2^71086817 is an apocalyptic number.

It is an amenable number.

71086817 is a deficient number, since it is larger than the sum of its proper divisors (1).

71086817 is an equidigital number, since it uses as much as digits as its factorization.

71086817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18816, while the sum is 38.

The square root of 71086817 is about 8431.2998404754. The cubic root of 71086817 is about 414.2504824294.

The spelling of 71086817 in words is "seventy-one million, eighty-six thousand, eight hundred seventeen".