243231013 has 4 divisors (see below), whose sum is σ = 243928300. Its totient is φ = 242533728.

The previous prime is 243231011. The next prime is 243231029. The reversal of 243231013 is 310132342.

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 104509729 + 138721284 = 10223^2 + 11778^2 .

It is a cyclic number.

It is not a de Polignac number, because 243231013 - 2¹ = 243231011 is a prime.

It is a super-2 number, since 2×243231013² = 118322651370012338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243231011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 348120 + ... + 348817.

It is an arithmetic number, because the mean of its divisors is an integer number (60982075).

Almost surely, 2^243231013 is an apocalyptic number.

It is an amenable number.

243231013 is a deficient number, since it is larger than the sum of its proper divisors (697287).

243231013 is an equidigital number, since it uses as much as digits as its factorization.

243231013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697286.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 243231013 is about 15595.8652533292. The cubic root of 243231013 is about 624.2228317758. Note that the first 3 decimals are identical.

Adding to 243231013 its reverse (310132342), we get a palindrome (553363355).

The spelling of 243231013 in words is "two hundred forty-three million, two hundred thirty-one thousand, thirteen".