9719999947 has 16 divisors (see below), whose sum is σ = 11219357952. Its totient is φ = 8248436640.

The previous prime is 9719999881. The next prime is 9719999959. The reversal of 9719999947 is 7499999179.

It is a cyclic number.

It is not a de Polignac number, because 9719999947 - 2³¹ = 7572516299 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9719999947.

It is not an unprimeable number, because it can be changed into a prime (9719999147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1660608 + ... + 1666450.

It is an arithmetic number, because the mean of its divisors is an integer number (701209872).

Almost surely, 2^9719999947 is an apocalyptic number.

9719999947 is a deficient number, since it is larger than the sum of its proper divisors (1499358005).

9719999947 is a wasteful number, since it uses less digits than its factorization.

9719999947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8178.

The product of its digits is 104162436, while the sum is 73.

The square root of 9719999947 is about 98590.0600821401. The cubic root of 9719999947 is about 2134.1359788151.

The spelling of 9719999947 in words is "nine billion, seven hundred nineteen million, nine hundred ninety-nine thousand, nine hundred forty-seven".