243110420261 has 2 divisors, whose sum is σ = 243110420262. Its totient is φ = 243110420260.

The previous prime is 243110420257. The next prime is 243110420281. The reversal of 243110420261 is 162024011342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 241877076100 + 1233344161 = 491810^2 + 35119^2 .

It is a cyclic number.

It is not a de Polignac number, because 243110420261 - 2² = 243110420257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243110420261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243110420281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121555210130 + 121555210131.

It is an arithmetic number, because the mean of its divisors is an integer number (121555210131).

Almost surely, 2^243110420261 is an apocalyptic number.

It is an amenable number.

243110420261 is a deficient number, since it is larger than the sum of its proper divisors (1).

243110420261 is an equidigital number, since it uses as much as digits as its factorization.

243110420261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 26.

The spelling of 243110420261 in words is "two hundred forty-three billion, one hundred ten million, four hundred twenty thousand, two hundred sixty-one".