9999712771 has 4 divisors (see below), whose sum is σ = 10022491600. Its totient is φ = 9976933944.

The previous prime is 9999712693. The next prime is 9999712777. The reversal of 9999712771 is 1772179999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1772179999 = 661 ⋅2681059.

It is a cyclic number.

It is not a de Polignac number, because 9999712771 - 2¹¹ = 9999710723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9999712777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11388756 + ... + 11389633.

It is an arithmetic number, because the mean of its divisors is an integer number (2505622900).

Almost surely, 2^9999712771 is an apocalyptic number.

9999712771 is a deficient number, since it is larger than the sum of its proper divisors (22778829).

9999712771 is a wasteful number, since it uses less digits than its factorization.

9999712771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22778828.

The product of its digits is 4500846, while the sum is 61.

The square root of 9999712771 is about 99998.5638446873. The cubic root of 9999712771 is about 2154.4140626303.

The spelling of 9999712771 in words is "nine billion, nine hundred ninety-nine million, seven hundred twelve thousand, seven hundred seventy-one".