71201039521 has 2 divisors, whose sum is σ = 71201039522. Its totient is φ = 71201039520.

The previous prime is 71201039491. The next prime is 71201039549. The reversal of 71201039521 is 12593010217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58687485025 + 12513554496 = 242255^2 + 111864^2 .

It is a cyclic number.

It is not a de Polignac number, because 71201039521 - 2¹³ = 71201031329 is a prime.

It is not a weakly prime, because it can be changed into another prime (71201039551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35600519760 + 35600519761.

It is an arithmetic number, because the mean of its divisors is an integer number (35600519761).

Almost surely, 2^71201039521 is an apocalyptic number.

It is an amenable number.

71201039521 is a deficient number, since it is larger than the sum of its proper divisors (1).

71201039521 is an equidigital number, since it uses as much as digits as its factorization.

71201039521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 31.

Adding to 71201039521 its reverse (12593010217), we get a palindrome (83794049738).

The spelling of 71201039521 in words is "seventy-one billion, two hundred one million, thirty-nine thousand, five hundred twenty-one".