9791999505 has 48 divisors (see below), whose sum is σ = 18246309120. Its totient is φ = 4842249984.

The previous prime is 9791999489. The next prime is 9791999527. The reversal of 9791999505 is 5059991979.

It is not a de Polignac number, because 9791999505 - 2⁴ = 9791999489 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 81652 + ... + 162021.

It is an arithmetic number, because the mean of its divisors is an integer number (380131440).

Almost surely, 2^9791999505 is an apocalyptic number.

9791999505 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

9791999505 is a deficient number, since it is larger than the sum of its proper divisors (8454309615).

9791999505 is a wasteful number, since it uses less digits than its factorization.

9791999505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243750 (or 243747 counting only the distinct ones).

The product of its (nonzero) digits is 10333575, while the sum is 63.

The square root of 9791999505 is about 98954.5325136752. The cubic root of 9791999505 is about 2139.3924604459.

The spelling of 9791999505 in words is "nine billion, seven hundred ninety-one million, nine hundred ninety-nine thousand, five hundred five".