243454737209 has 2 divisors, whose sum is σ = 243454737210. Its totient is φ = 243454737208.

The previous prime is 243454737193. The next prime is 243454737233. The reversal of 243454737209 is 902737454342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 243440599609 + 14137600 = 493397^2 + 3760^2 .

It is a cyclic number.

It is not a de Polignac number, because 243454737209 - 2⁴ = 243454737193 is a prime.

It is not a weakly prime, because it can be changed into another prime (243454737259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121727368604 + 121727368605.

It is an arithmetic number, because the mean of its divisors is an integer number (121727368605).

Almost surely, 2^243454737209 is an apocalyptic number.

It is an amenable number.

243454737209 is a deficient number, since it is larger than the sum of its proper divisors (1).

243454737209 is an equidigital number, since it uses as much as digits as its factorization.

243454737209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5080320, while the sum is 50.

The spelling of 243454737209 in words is "two hundred forty-three billion, four hundred fifty-four million, seven hundred thirty-seven thousand, two hundred nine".