71313180581 has 2 divisors, whose sum is σ = 71313180582. Its totient is φ = 71313180580.

The previous prime is 71313180571. The next prime is 71313180607. The reversal of 71313180581 is 18508131317.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60091168225 + 11222012356 = 245135^2 + 105934^2 .

It is a cyclic number.

It is not a de Polignac number, because 71313180581 - 2²² = 71308986277 is a prime.

It is a super-2 number, since 2×71313180581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71313180571) 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, 35656590290 + 35656590291.

It is an arithmetic number, because the mean of its divisors is an integer number (35656590291).

Almost surely, 2^71313180581 is an apocalyptic number.

It is an amenable number.

71313180581 is a deficient number, since it is larger than the sum of its proper divisors (1).

71313180581 is an equidigital number, since it uses as much as digits as its factorization.

71313180581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 38.

The spelling of 71313180581 in words is "seventy-one billion, three hundred thirteen million, one hundred eighty thousand, five hundred eighty-one".