243011 has 2 divisors, whose sum is σ = 243012. Its totient is φ = 243010.

The previous prime is 242999. The next prime is 243031. The reversal of 243011 is 110342.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243011 is a prime.

It is a super-2 number, since 2×243011² = 118108692242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 242983 and 243001.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 243011.

It is not a weakly prime, because it can be changed into another prime (243031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121505 + 121506.

It is an arithmetic number, because the mean of its divisors is an integer number (121506).

2²⁴³⁰¹¹ is an apocalyptic number.

243011 is a deficient number, since it is larger than the sum of its proper divisors (1).

243011 is an equidigital number, since it uses as much as digits as its factorization.

It is an anagram of its base 9 representation: 243011 = (410312)₉.

243011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 243011 is about 492.9614589397. The cubic root of 243011 is about 62.4034562791.

Adding to 243011 its reverse (110342), we get a palindrome (353353).

The spelling of 243011 in words is "two hundred forty-three thousand, eleven", and thus it is an iban number.