9999769931 has 4 divisors (see below), whose sum is σ = 10005575352. Its totient is φ = 9993964512.

The previous prime is 9999769921. The next prime is 9999769933. The reversal of 9999769931 is 1399679999.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9999769931 - 2²² = 9995575627 is a prime.

It is a super-2 number, since 2×9999769931² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9999769933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2900126 + ... + 2903571.

It is an arithmetic number, because the mean of its divisors is an integer number (2501393838).

Almost surely, 2^9999769931 is an apocalyptic number.

9999769931 is a deficient number, since it is larger than the sum of its proper divisors (5805421).

9999769931 is a wasteful number, since it uses less digits than its factorization.

9999769931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5805420.

The product of its digits is 66961566, while the sum is 71.

The square root of 9999769931 is about 99998.8496483835. The cubic root of 9999769931 is about 2154.4181676173.

The spelling of 9999769931 in words is "nine billion, nine hundred ninety-nine million, seven hundred sixty-nine thousand, nine hundred thirty-one".