997565 has 8 divisors (see below), whose sum is σ = 1207008. Its totient is φ = 791440.

The previous prime is 997553. The next prime is 997573. The reversal of 997565 is 565799.

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

It is not a de Polignac number, because 997565 - 2⁸ = 997309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 997565.

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 7 ways as a sum of consecutive naturals, for example, 107 + ... + 1416.

It is an arithmetic number, because the mean of its divisors is an integer number (150876).

2⁹⁹⁷⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

997565 is a deficient number, since it is larger than the sum of its proper divisors (209443).

997565 is a wasteful number, since it uses less digits than its factorization.

997565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1659.

The product of its digits is 85050, while the sum is 41.

The square root of 997565 is about 998.7817579431. The cubic root of 997565 is about 99.9187673638.

The spelling of 997565 in words is "nine hundred ninety-seven thousand, five hundred sixty-five".