71315641 has 2 divisors, whose sum is σ = 71315642. Its totient is φ = 71315640.

The previous prime is 71315633. The next prime is 71315653. The reversal of 71315641 is 14651317.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67174416 + 4141225 = 8196^2 + 2035^2 .

It is an emirp because it is prime and its reverse (14651317) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71315641 - 2³ = 71315633 is a prime.

It is not a weakly prime, because it can be changed into another prime (71315681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35657820 + 35657821.

It is an arithmetic number, because the mean of its divisors is an integer number (35657821).

Almost surely, 2^71315641 is an apocalyptic number.

It is an amenable number.

71315641 is a deficient number, since it is larger than the sum of its proper divisors (1).

71315641 is an equidigital number, since it uses as much as digits as its factorization.

71315641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2520, while the sum is 28.

The square root of 71315641 is about 8444.8588502118. The cubic root of 71315641 is about 414.6944884571.

Adding to 71315641 its reverse (14651317), we get a palindrome (85966958).

The spelling of 71315641 in words is "seventy-one million, three hundred fifteen thousand, six hundred forty-one".