243261313 has 16 divisors (see below), whose sum is σ = 272574720. Its totient is φ = 215744256.

The previous prime is 243261311. The next prime is 243261341. The reversal of 243261313 is 313162342.

It is a cyclic number.

It is not a de Polignac number, because 243261313 - 2¹ = 243261311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243261311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61720 + ... + 65542.

It is an arithmetic number, because the mean of its divisors is an integer number (17035920).

Almost surely, 2^243261313 is an apocalyptic number.

It is an amenable number.

243261313 is a deficient number, since it is larger than the sum of its proper divisors (29313407).

243261313 is a wasteful number, since it uses less digits than its factorization.

243261313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4056.

The product of its digits is 2592, while the sum is 25.

The square root of 243261313 is about 15596.8366343948. The cubic root of 243261313 is about 624.2487511220.

The spelling of 243261313 in words is "two hundred forty-three million, two hundred sixty-one thousand, three hundred thirteen".