71685041 has 2 divisors, whose sum is σ = 71685042. Its totient is φ = 71685040.

The previous prime is 71684993. The next prime is 71685077. The reversal of 71685041 is 14058617.

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., 50708641 + 20976400 = 7121^2 + 4580^2 .

It is an emirp because it is prime and its reverse (14058617) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71685041 - 2²⁶ = 4576177 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 71684989 and 71685007.

It is not a weakly prime, because it can be changed into another prime (71685091) 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, 35842520 + 35842521.

It is an arithmetic number, because the mean of its divisors is an integer number (35842521).

Almost surely, 2^71685041 is an apocalyptic number.

It is an amenable number.

71685041 is a deficient number, since it is larger than the sum of its proper divisors (1).

71685041 is an equidigital number, since it uses as much as digits as its factorization.

71685041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 71685041 is about 8466.7018962522. The cubic root of 71685041 is about 415.4092657780.

The spelling of 71685041 in words is "seventy-one million, six hundred eighty-five thousand, forty-one".