71020505969 has 6 divisors (see below), whose sum is σ = 82615690674. Its totient is φ = 60874719360.

The previous prime is 71020505947. The next prime is 71020506071. The reversal of 71020505969 is 96950502017.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 61127617600 + 9892888369 = 247240^2 + 99463^2 .

It is not a de Polignac number, because 71020505969 - 2³⁶ = 2301029233 is a prime.

It is a super-2 number, since 2×71020505969² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71020505069) 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 in 5 ways as a sum of consecutive naturals, for example, 724698992 + ... + 724699089.

It is an arithmetic number, because the mean of its divisors is an integer number (13769281779).

Almost surely, 2^71020505969 is an apocalyptic number.

It is an amenable number.

71020505969 is a deficient number, since it is larger than the sum of its proper divisors (11595184705).

71020505969 is a wasteful number, since it uses less digits than its factorization.

71020505969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1449398095 (or 1449398088 counting only the distinct ones).

The product of its (nonzero) digits is 170100, while the sum is 44.

The spelling of 71020505969 in words is "seventy-one billion, twenty million, five hundred five thousand, nine hundred sixty-nine".