9999081071 has 48 divisors (see below), whose sum is σ = 12388334400. Its totient is φ = 8033905152.

The previous prime is 9999081023. The next prime is 9999081073. The reversal of 9999081071 is 1701809999.

It is not a de Polignac number, because 9999081071 - 2²² = 9994886767 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999081073) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7756595 + ... + 7757883.

It is an arithmetic number, because the mean of its divisors is an integer number (258090300).

Almost surely, 2^9999081071 is an apocalyptic number.

9999081071 is a deficient number, since it is larger than the sum of its proper divisors (2389253329).

9999081071 is a wasteful number, since it uses less digits than its factorization.

9999081071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1488 (or 1481 counting only the distinct ones).

The product of its (nonzero) digits is 367416, while the sum is 53.

The square root of 9999081071 is about 99995.4052494413. The cubic root of 9999081071 is about 2154.3686955932.

The spelling of 9999081071 in words is "nine billion, nine hundred ninety-nine million, eighty-one thousand, seventy-one".