243013313 has 4 divisors (see below), whose sum is σ = 243144660. Its totient is φ = 242881968.

The previous prime is 243013307. The next prime is 243013361. The reversal of 243013313 is 313310342.

243013313 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 79352464 + 163660849 = 8908^2 + 12793^2 .

It is a cyclic number.

It is not a de Polignac number, because 243013313 - 2¹⁸ = 242751169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243013013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62858 + ... + 66611.

It is an arithmetic number, because the mean of its divisors is an integer number (60786165).

Almost surely, 2^243013313 is an apocalyptic number.

It is an amenable number.

243013313 is a deficient number, since it is larger than the sum of its proper divisors (131347).

243013313 is a wasteful number, since it uses less digits than its factorization.

243013313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131346.

The product of its (nonzero) digits is 648, while the sum is 20.

The square root of 243013313 is about 15588.8842769455. The cubic root of 243013313 is about 624.0365426564.

Adding to 243013313 its reverse (313310342), we get a palindrome (556323655).

The spelling of 243013313 in words is "two hundred forty-three million, thirteen thousand, three hundred thirteen".