997523 has 4 divisors (see below), whose sum is σ = 999648. Its totient is φ = 995400.

The previous prime is 997511. The next prime is 997541. The reversal of 997523 is 325799.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 325799 = 73 ⋅4463.

It is a cyclic number.

It is not a de Polignac number, because 997523 - 2⁸ = 997267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11 + ... + 1412.

It is an arithmetic number, because the mean of its divisors is an integer number (249912).

2⁹⁹⁷⁵²³ is an apocalyptic number.

997523 is a deficient number, since it is larger than the sum of its proper divisors (2125).

997523 is a wasteful number, since it uses less digits than its factorization.

997523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2124.

The product of its digits is 17010, while the sum is 35.

The square root of 997523 is about 998.7607321075. The cubic root of 997523 is about 99.9173650668.

The spelling of 997523 in words is "nine hundred ninety-seven thousand, five hundred twenty-three".