997515717 has 8 divisors (see below), whose sum is σ = 1450932000. Its totient is φ = 604554960.

The previous prime is 997515683. The next prime is 997515721. The reversal of 997515717 is 717515799.

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

It is not a de Polignac number, because 997515717 - 2⁶ = 997515653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 997515717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997515787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15113842 + ... + 15113907.

It is an arithmetic number, because the mean of its divisors is an integer number (181366500).

Almost surely, 2^997515717 is an apocalyptic number.

It is an amenable number.

997515717 is a deficient number, since it is larger than the sum of its proper divisors (453416283).

997515717 is a wasteful number, since it uses less digits than its factorization.

997515717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30227763.

The product of its digits is 694575, while the sum is 51.

The square root of 997515717 is about 31583.4722125355. The cubic root of 997515717 is about 999.1712189784.

The spelling of 997515717 in words is "nine hundred ninety-seven million, five hundred fifteen thousand, seven hundred seventeen".