71315558989 has 2 divisors, whose sum is σ = 71315558990. Its totient is φ = 71315558988.

The previous prime is 71315558981. The next prime is 71315559001. The reversal of 71315558989 is 98985551317.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65199536964 + 6116022025 = 255342^2 + 78205^2 .

It is a cyclic number.

It is not a de Polignac number, because 71315558989 - 2³ = 71315558981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71315558981) 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, 35657779494 + 35657779495.

It is an arithmetic number, because the mean of its divisors is an integer number (35657779495).

Almost surely, 2^71315558989 is an apocalyptic number.

It is an amenable number.

71315558989 is a deficient number, since it is larger than the sum of its proper divisors (1).

71315558989 is an equidigital number, since it uses as much as digits as its factorization.

71315558989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608000, while the sum is 61.

The spelling of 71315558989 in words is "seventy-one billion, three hundred fifteen million, five hundred fifty-eight thousand, nine hundred eighty-nine".