243253511 has 2 divisors, whose sum is σ = 243253512. Its totient is φ = 243253510.

The previous prime is 243253487. The next prime is 243253513. The reversal of 243253511 is 115352342.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243253511 - 2¹⁸ = 242991367 is a prime.

It is a super-2 number, since 2×243253511² = 118344541227654242, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 243253513, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243253513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121626755 + 121626756.

It is an arithmetic number, because the mean of its divisors is an integer number (121626756).

Almost surely, 2^243253511 is an apocalyptic number.

243253511 is a deficient number, since it is larger than the sum of its proper divisors (1).

243253511 is an equidigital number, since it uses as much as digits as its factorization.

243253511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3600, while the sum is 26.

The square root of 243253511 is about 15596.5865175685. The cubic root of 243253511 is about 624.2420773100.

The spelling of 243253511 in words is "two hundred forty-three million, two hundred fifty-three thousand, five hundred eleven".