243497 has 4 divisors (see below), whose sum is σ = 250116. Its totient is φ = 236880.

The previous prime is 243487. The next prime is 243517. The reversal of 243497 is 794342.

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 143641 + 99856 = 379^2 + 316^2 .

It is a cyclic number.

It is not a de Polignac number, because 243497 - 2⁶ = 243433 is a prime.

It is a d-powerful number, because it can be written as 2⁵ + 4 + 4⁸ + 3¹¹ + 9³ + 7² .

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 243497.

It is not an unprimeable number, because it can be changed into a prime (243437) 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, 3254 + ... + 3327.

It is an arithmetic number, because the mean of its divisors is an integer number (62529).

2²⁴³⁴⁹⁷ is an apocalyptic number.

It is an amenable number.

243497 is a deficient number, since it is larger than the sum of its proper divisors (6619).

243497 is an equidigital number, since it uses as much as digits as its factorization.

243497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6618.

The product of its digits is 6048, while the sum is 29.

The square root of 243497 is about 493.4541518723. The cubic root of 243497 is about 62.4450289985.

The spelling of 243497 in words is "two hundred forty-three thousand, four hundred ninety-seven".