71022521 has 2 divisors, whose sum is σ = 71022522. Its totient is φ = 71022520.

The previous prime is 71022509. The next prime is 71022559. The reversal of 71022521 is 12522017.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53290000 + 17732521 = 7300^2 + 4211^2 .

It is an emirp because it is prime and its reverse (12522017) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71022521 - 2¹⁰ = 71021497 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71022493 and 71022502.

It is not a weakly prime, because it can be changed into another prime (71022221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35511260 + 35511261.

It is an arithmetic number, because the mean of its divisors is an integer number (35511261).

Almost surely, 2^71022521 is an apocalyptic number.

It is an amenable number.

71022521 is a deficient number, since it is larger than the sum of its proper divisors (1).

71022521 is an equidigital number, since it uses as much as digits as its factorization.

71022521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 71022521 is about 8427.4860427057. The cubic root of 71022521 is about 414.1255521715.

Adding to 71022521 its reverse (12522017), we get a palindrome (83544538).

The spelling of 71022521 in words is "seventy-one million, twenty-two thousand, five hundred twenty-one".