243011312261 has 4 divisors (see below), whose sum is σ = 243012299712. Its totient is φ = 243010324812.

The previous prime is 243011312239. The next prime is 243011312333. The reversal of 243011312261 is 162213110342.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 243011312261 - 2¹⁰ = 243011311237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 243011312261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243011312561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205700 + ... + 726866.

It is an arithmetic number, because the mean of its divisors is an integer number (60753074928).

Almost surely, 2^243011312261 is an apocalyptic number.

It is an amenable number.

243011312261 is a deficient number, since it is larger than the sum of its proper divisors (987451).

243011312261 is an equidigital number, since it uses as much as digits as its factorization.

243011312261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 987450.

The product of its (nonzero) digits is 1728, while the sum is 26.

The spelling of 243011312261 in words is "two hundred forty-three billion, eleven million, three hundred twelve thousand, two hundred sixty-one".