243144281 has 2 divisors, whose sum is σ = 243144282. Its totient is φ = 243144280.

The previous prime is 243144271. The next prime is 243144299. The reversal of 243144281 is 182441342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 233478400 + 9665881 = 15280^2 + 3109^2 .

It is a cyclic number.

It is not a de Polignac number, because 243144281 - 2²⁶ = 176035417 is a prime.

It is a super-2 number, since 2×243144281² = 118238282766013922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (243144211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121572140 + 121572141.

It is an arithmetic number, because the mean of its divisors is an integer number (121572141).

Almost surely, 2^243144281 is an apocalyptic number.

It is an amenable number.

243144281 is a deficient number, since it is larger than the sum of its proper divisors (1).

243144281 is an equidigital number, since it uses as much as digits as its factorization.

243144281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6144, while the sum is 29.

The square root of 243144281 is about 15593.0843966163. The cubic root of 243144281 is about 624.1486272430.

The spelling of 243144281 in words is "two hundred forty-three million, one hundred forty-four thousand, two hundred eighty-one".