243621436273 has 2 divisors, whose sum is σ = 243621436274. Its totient is φ = 243621436272.

The previous prime is 243621436259. The next prime is 243621436309. The reversal of 243621436273 is 372634126342.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197177738209 + 46443698064 = 444047^2 + 215508^2 .

It is a cyclic number.

It is not a de Polignac number, because 243621436273 - 2¹³ = 243621428081 is a prime.

It is not a weakly prime, because it can be changed into another prime (243621436673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121810718136 + 121810718137.

It is an arithmetic number, because the mean of its divisors is an integer number (121810718137).

Almost surely, 2^243621436273 is an apocalyptic number.

It is an amenable number.

243621436273 is a deficient number, since it is larger than the sum of its proper divisors (1).

243621436273 is an equidigital number, since it uses as much as digits as its factorization.

243621436273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 43.

The spelling of 243621436273 in words is "two hundred forty-three billion, six hundred twenty-one million, four hundred thirty-six thousand, two hundred seventy-three".