71065861 has 2 divisors, whose sum is σ = 71065862. Its totient is φ = 71065860.

The previous prime is 71065859. The next prime is 71065903. The reversal of 71065861 is 16856017.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71064900 + 961 = 8430^2 + 31^2 .

It is an emirp because it is prime and its reverse (16856017) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71065861 - 2¹ = 71065859 is a prime.

Together with 71065859, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71095861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35532930 + 35532931.

It is an arithmetic number, because the mean of its divisors is an integer number (35532931).

Almost surely, 2^71065861 is an apocalyptic number.

It is an amenable number.

71065861 is a deficient number, since it is larger than the sum of its proper divisors (1).

71065861 is an equidigital number, since it uses as much as digits as its factorization.

71065861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 71065861 is about 8430.0569986211. The cubic root of 71065861 is about 414.2097721793.

The spelling of 71065861 in words is "seventy-one million, sixty-five thousand, eight hundred sixty-one".