243694084961 has 4 divisors (see below), whose sum is σ = 252097329300. Its totient is φ = 235290840624.

The previous prime is 243694084937. The next prime is 243694084981. The reversal of 243694084961 is 169480496342.

243694084961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 95589180625 + 148104904336 = 309175^2 + 384844^2 .

It is a cyclic number.

It is not a de Polignac number, because 243694084961 - 2⁶ = 243694084897 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243694084897 and 243694084906.

It is not an unprimeable number, because it can be changed into a prime (243694084981) 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, 4201622126 + ... + 4201622183.

It is an arithmetic number, because the mean of its divisors is an integer number (63024332325).

Almost surely, 2^243694084961 is an apocalyptic number.

It is an amenable number.

243694084961 is a deficient number, since it is larger than the sum of its proper divisors (8403244339).

243694084961 is an equidigital number, since it uses as much as digits as its factorization.

243694084961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8403244338.

The product of its (nonzero) digits is 8957952, while the sum is 56.

The spelling of 243694084961 in words is "two hundred forty-three billion, six hundred ninety-four million, eighty-four thousand, nine hundred sixty-one".