243712913 has 4 divisors (see below), whose sum is σ = 243777828. Its totient is φ = 243648000.

The previous prime is 243712891. The next prime is 243712939. The reversal of 243712913 is 319217342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 319217342 = 2 ⋅159608671.

It can be written as a sum of positive squares in 2 ways, for example, as 3214849 + 240498064 = 1793^2 + 15508^2 .

It is a cyclic number.

It is not a de Polignac number, because 243712913 - 2⁶ = 243712849 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243712913.

It is not an unprimeable number, because it can be changed into a prime (243712993) 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, 26456 + ... + 34457.

It is an arithmetic number, because the mean of its divisors is an integer number (60944457).

Almost surely, 2^243712913 is an apocalyptic number.

It is an amenable number.

243712913 is a deficient number, since it is larger than the sum of its proper divisors (64915).

243712913 is an equidigital number, since it uses as much as digits as its factorization.

243712913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64914.

The product of its digits is 9072, while the sum is 32.

The square root of 243712913 is about 15611.3072162455. The cubic root of 243712913 is about 624.6348057479.

The spelling of 243712913 in words is "two hundred forty-three million, seven hundred twelve thousand, nine hundred thirteen".