243013013 has 2 divisors, whose sum is σ = 243013014. Its totient is φ = 243013012.

The previous prime is 243012989. The next prime is 243013019. The reversal of 243013013 is 310310342.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143472484 + 99540529 = 11978^2 + 9977^2 .

It is a cyclic number.

It is not a de Polignac number, because 243013013 - 2¹⁸ = 242750869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243012982 and 243013000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243013019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121506506 + 121506507.

It is an arithmetic number, because the mean of its divisors is an integer number (121506507).

Almost surely, 2^243013013 is an apocalyptic number.

It is an amenable number.

243013013 is a deficient number, since it is larger than the sum of its proper divisors (1).

243013013 is an equidigital number, since it uses as much as digits as its factorization.

243013013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 243013013 is about 15588.8746547017. The cubic root of 243013013 is about 624.0362858652.

Adding to 243013013 its reverse (310310342), we get a palindrome (553323355).

The spelling of 243013013 in words is "two hundred forty-three million, thirteen thousand, thirteen".