71020386209 has 24 divisors (see below), whose sum is σ = 77732517888. Its totient is φ = 64840186880.

The previous prime is 71020386139. The next prime is 71020386221. The reversal of 71020386209 is 90268302017.

It is not a de Polignac number, because 71020386209 - 2¹² = 71020382113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71020386289) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1511744 + ... + 1558014.

It is an arithmetic number, because the mean of its divisors is an integer number (3238854912).

Almost surely, 2^71020386209 is an apocalyptic number.

It is an amenable number.

71020386209 is a deficient number, since it is larger than the sum of its proper divisors (6712131679).

71020386209 is a wasteful number, since it uses less digits than its factorization.

71020386209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46465 (or 46448 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The spelling of 71020386209 in words is "seventy-one billion, twenty million, three hundred eighty-six thousand, two hundred nine".