243193 has 4 divisors (see below), whose sum is σ = 244900. Its totient is φ = 241488.

The previous prime is 243167. The next prime is 243197. The reversal of 243193 is 391342.

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 76729 + 166464 = 277^2 + 408^2 .

It is a cyclic number.

It is not a de Polignac number, because 243193 - 2⁵ = 243161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243197) by changing a digit.

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, 618 + ... + 931.

It is an arithmetic number, because the mean of its divisors is an integer number (61225).

2²⁴³¹⁹³ is an apocalyptic number.

It is an amenable number.

243193 is a deficient number, since it is larger than the sum of its proper divisors (1707).

243193 is a wasteful number, since it uses less digits than its factorization.

243193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1706.

The product of its digits is 648, while the sum is 22.

The square root of 243193 is about 493.1460229993. The cubic root of 243193 is about 62.4190311500.

The spelling of 243193 in words is "two hundred forty-three thousand, one hundred ninety-three".