71741528521 has 16 divisors (see below), whose sum is σ = 81815351184. Its totient is φ = 62319458304.

The previous prime is 71741528503. The next prime is 71741528533. The reversal of 71741528521 is 12582514717.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 5405625 + 71736122896 = 2325^2 + 267836^2 .

It is a cyclic number.

It is not a de Polignac number, because 71741528521 - 2¹¹ = 71741526473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71741528501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2263435 + ... + 2294911.

It is an arithmetic number, because the mean of its divisors is an integer number (5113459449).

Almost surely, 2^71741528521 is an apocalyptic number.

It is an amenable number.

71741528521 is a deficient number, since it is larger than the sum of its proper divisors (10073822663).

71741528521 is a wasteful number, since it uses less digits than its factorization.

71741528521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41820.

The product of its digits is 156800, while the sum is 43.

The spelling of 71741528521 in words is "seventy-one billion, seven hundred forty-one million, five hundred twenty-eight thousand, five hundred twenty-one".