9915972047 has 4 divisors (see below), whose sum is σ = 9916242336. Its totient is φ = 9915701760.

The previous prime is 9915972023. The next prime is 9915972107. The reversal of 9915972047 is 7402795199.

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 9915972047 - 2¹⁴ = 9915955663 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 9915972047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9915902047) 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 3 ways as a sum of consecutive naturals, for example, 69479 + ... + 157032.

It is an arithmetic number, because the mean of its divisors is an integer number (2479060584).

Almost surely, 2^9915972047 is an apocalyptic number.

9915972047 is a deficient number, since it is larger than the sum of its proper divisors (270289).

9915972047 is a wasteful number, since it uses less digits than its factorization.

9915972047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270288.

The product of its (nonzero) digits is 1428840, while the sum is 53.

The square root of 9915972047 is about 99578.9739202006. The cubic root of 9915972047 is about 2148.3832841109.

The spelling of 9915972047 in words is "nine billion, nine hundred fifteen million, nine hundred seventy-two thousand, forty-seven".