243031013 has 4 divisors (see below), whose sum is σ = 244805100. Its totient is φ = 241256928.

The previous prime is 243031007. The next prime is 243031037. The reversal of 243031013 is 310130342.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 310130342 = 2 ⋅155065171.

It can be written as a sum of positive squares in 2 ways, for example, as 48205249 + 194825764 = 6943^2 + 13958^2 .

It is a cyclic number.

It is not a de Polignac number, because 243031013 - 2¹⁶ = 242965477 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243030982 and 243031000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243031913) 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, 886838 + ... + 887111.

It is an arithmetic number, because the mean of its divisors is an integer number (61201275).

Almost surely, 2^243031013 is an apocalyptic number.

It is an amenable number.

243031013 is a deficient number, since it is larger than the sum of its proper divisors (1774087).

243031013 is a wasteful number, since it uses less digits than its factorization.

243031013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1774086.

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

The square root of 243031013 is about 15589.4519788221. The cubic root of 243031013 is about 624.0516929631.

Adding to 243031013 its reverse (310130342), we get a palindrome (553161355).

The spelling of 243031013 in words is "two hundred forty-three million, thirty-one thousand, thirteen".