243304143961 has 2 divisors, whose sum is σ = 243304143962. Its totient is φ = 243304143960.

The previous prime is 243304143923. The next prime is 243304144033. The reversal of 243304143961 is 169341403342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 223332801561 + 19971342400 = 472581^2 + 141320^2 .

It is a cyclic number.

It is not a de Polignac number, because 243304143961 - 2²¹ = 243302046809 is a prime.

It is not a weakly prime, because it can be changed into another prime (243304144961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121652071980 + 121652071981.

It is an arithmetic number, because the mean of its divisors is an integer number (121652071981).

Almost surely, 2^243304143961 is an apocalyptic number.

It is an amenable number.

243304143961 is a deficient number, since it is larger than the sum of its proper divisors (1).

243304143961 is an equidigital number, since it uses as much as digits as its factorization.

243304143961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 40.

The spelling of 243304143961 in words is "two hundred forty-three billion, three hundred four million, one hundred forty-three thousand, nine hundred sixty-one".