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243013 = 487499

243013 has 4 divisors (see below), whose sum is σ = 244000. Its totient is φ = 242028.

The previous prime is 243011. The next prime is 243031. The reversal of 243013 is 310342.

Adding to 243013 its reverse (310342), we get a palindrome (553355).

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 310342 = 2155171.

It is a cyclic number.

It is not a de Polignac number, because 243013 - 21 = 243011 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 242984 and 243002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243011) 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, 238 + ... + 736.

It is an arithmetic number, because the mean of its divisors is an integer number (61000).

2243013 is an apocalyptic number.

243013 is the 264-th centered heptagonal number.

It is an amenable number.

243013 is a deficient number, since it is larger than the sum of its proper divisors (987).

243013 is an equidigital number, since it uses as much as digits as its factorization.

243013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 243013 is about 492.9634874917. The cubic root of 243013 is about 62.4036274738.

The spelling of 243013 in words is "two hundred forty-three thousand, thirteen".

Divisors: 1 487 499 243013