9930929681 has 4 divisors (see below), whose sum is σ = 9935769012. Its totient is φ = 9926090352.

The previous prime is 9930929669. The next prime is 9930929699. The reversal of 9930929681 is 1869290399.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1869290399 = 281 ⋅6652279.

It can be written as a sum of positive squares in 2 ways, for example, as 5508014656 + 4422915025 = 74216^2 + 66505^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9930929681 is a prime.

It is a super-2 number, since 2×9930929681² (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 (9930829681) 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, 2416586 + ... + 2420691.

It is an arithmetic number, because the mean of its divisors is an integer number (2483942253).

Almost surely, 2^9930929681 is an apocalyptic number.

It is an amenable number.

9930929681 is a deficient number, since it is larger than the sum of its proper divisors (4839331).

9930929681 is a wasteful number, since it uses less digits than its factorization.

9930929681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4839330.

The product of its (nonzero) digits is 1889568, while the sum is 56.

The square root of 9930929681 is about 99654.0499979805. The cubic root of 9930929681 is about 2149.4629760959.

The spelling of 9930929681 in words is "nine billion, nine hundred thirty million, nine hundred twenty-nine thousand, six hundred eighty-one".