243133261 has 4 divisors (see below), whose sum is σ = 277866592. Its totient is φ = 208399932.

The previous prime is 243133237. The next prime is 243133333. The reversal of 243133261 is 162331342.

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.

It is a cyclic number.

It is not a de Polignac number, because 243133261 - 2¹⁹ = 242608973 is a prime.

It is a super-2 number, since 2×243133261² = 118227565208988242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243133661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17366655 + ... + 17366668.

It is an arithmetic number, because the mean of its divisors is an integer number (69466648).

Almost surely, 2^243133261 is an apocalyptic number.

It is an amenable number.

243133261 is a deficient number, since it is larger than the sum of its proper divisors (34733331).

243133261 is an equidigital number, since it uses as much as digits as its factorization.

243133261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34733330.

The product of its digits is 2592, while the sum is 25.

The square root of 243133261 is about 15592.7310308361. The cubic root of 243133261 is about 624.1391976953.

The spelling of 243133261 in words is "two hundred forty-three million, one hundred thirty-three thousand, two hundred sixty-one".