71320509481 has 9 divisors (see below), whose sum is σ = 77232476919. Its totient is φ = 65831111736.

The previous prime is 71320509443. The next prime is 71320509497. The reversal of 71320509481 is 18490502317.

The square root of 71320509481 is 267059.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 10550371225 + 60770138256 = 102715^2 + 246516^2 .

It is not a de Polignac number, because 71320509481 - 2¹³ = 71320501289 is a prime.

It is a super-2 number, since 2×71320509481² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71320509401) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3461496 + ... + 3482038.

Almost surely, 2^71320509481 is an apocalyptic number.

71320509481 is the 267059-th square number.

71320509481 is the 133530-th centered octagonal number.

It is an amenable number.

71320509481 is a deficient number, since it is larger than the sum of its proper divisors (5911967438).

71320509481 is an frugal number, since it uses more digits than its factorization.

71320509481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41112 (or 20556 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 71320509481 in words is "seventy-one billion, three hundred twenty million, five hundred nine thousand, four hundred eighty-one".