71168521 has 2 divisors, whose sum is σ = 71168522. Its totient is φ = 71168520.

The previous prime is 71168507. The next prime is 71168527. The reversal of 71168521 is 12586117.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61402896 + 9765625 = 7836^2 + 3125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71168521 is a prime.

It is not a weakly prime, because it can be changed into another prime (71168527) 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, 35584260 + 35584261.

It is an arithmetic number, because the mean of its divisors is an integer number (35584261).

Almost surely, 2^71168521 is an apocalyptic number.

It is an amenable number.

71168521 is a deficient number, since it is larger than the sum of its proper divisors (1).

71168521 is an equidigital number, since it uses as much as digits as its factorization.

71168521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 31.

The square root of 71168521 is about 8436.1437280312. The cubic root of 71168521 is about 414.4091286413.

The spelling of 71168521 in words is "seventy-one million, one hundred sixty-eight thousand, five hundred twenty-one".