9997215517 has 8 divisors (see below), whose sum is σ = 10597568256. Its totient is φ = 9398227392.

The previous prime is 9997215497. The next prime is 9997215521. The reversal of 9997215517 is 7155127999.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9997215517 - 2¹⁵ = 9997182749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9997215317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 326043 + ... + 355384.

It is an arithmetic number, because the mean of its divisors is an integer number (1324696032).

Almost surely, 2^9997215517 is an apocalyptic number.

It is an amenable number.

9997215517 is a deficient number, since it is larger than the sum of its proper divisors (600352739).

9997215517 is a wasteful number, since it uses less digits than its factorization.

9997215517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682307.

The product of its digits is 1786050, while the sum is 55.

The square root of 9997215517 is about 99986.0766156968. The cubic root of 9997215517 is about 2154.2347052433.

The spelling of 9997215517 in words is "nine billion, nine hundred ninety-seven million, two hundred fifteen thousand, five hundred seventeen".