9997565 has 4 divisors (see below), whose sum is σ = 11997084. Its totient is φ = 7998048.

The previous prime is 9997523. The next prime is 9997573. The reversal of 9997565 is 5657999.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1170724 + 8826841 = 1082^2 + 2971^2 .

It is a cyclic number.

It is not a de Polignac number, because 9997565 - 2¹⁰ = 9996541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 999752 + ... + 999761.

It is an arithmetic number, because the mean of its divisors is an integer number (2999271).

Almost surely, 2^9997565 is an apocalyptic number.

It is an amenable number.

9997565 is a deficient number, since it is larger than the sum of its proper divisors (1999519).

9997565 is a wasteful number, since it uses less digits than its factorization.

9997565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1999518.

The product of its digits is 765450, while the sum is 50.

The square root of 9997565 is about 3161.8926294231. The cubic root of 9997565 is about 215.4259807554.

The spelling of 9997565 in words is "nine million, nine hundred ninety-seven thousand, five hundred sixty-five".