71865841 has 2 divisors, whose sum is σ = 71865842. Its totient is φ = 71865840.

The previous prime is 71865713. The next prime is 71865863. The reversal of 71865841 is 14856817.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40056241 + 31809600 = 6329^2 + 5640^2 .

It is an emirp because it is prime and its reverse (14856817) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71865841 - 2⁷ = 71865713 is a prime.

It is a super-3 number, since 3×71865841³ (a number of 25 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71865794 and 71865803.

It is not a weakly prime, because it can be changed into another prime (71869841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35932920 + 35932921.

It is an arithmetic number, because the mean of its divisors is an integer number (35932921).

Almost surely, 2^71865841 is an apocalyptic number.

It is an amenable number.

71865841 is a deficient number, since it is larger than the sum of its proper divisors (1).

71865841 is an equidigital number, since it uses as much as digits as its factorization.

71865841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53760, while the sum is 40.

The square root of 71865841 is about 8477.3722933466. The cubic root of 71865841 is about 415.7582132470.

The spelling of 71865841 in words is "seventy-one million, eight hundred sixty-five thousand, eight hundred forty-one".