997573 has 2 divisors, whose sum is σ = 997574. Its totient is φ = 997572.

The previous prime is 997553. The next prime is 997583. The reversal of 997573 is 375799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 544644 + 452929 = 738^2 + 673^2 .

It is an emirp because it is prime and its reverse (375799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 997573 - 2⁵ = 997541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another 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 as a sum of consecutive naturals, namely, 498786 + 498787.

It is an arithmetic number, because the mean of its divisors is an integer number (498787).

2⁹⁹⁷⁵⁷³ is an apocalyptic number.

It is an amenable number.

997573 is a deficient number, since it is larger than the sum of its proper divisors (1).

997573 is an equidigital number, since it uses as much as digits as its factorization.

997573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 59535, while the sum is 40.

The square root of 997573 is about 998.7857628140. The cubic root of 997573 is about 99.9190344635.

The spelling of 997573 in words is "nine hundred ninety-seven thousand, five hundred seventy-three".