243194970749 has 2 divisors, whose sum is σ = 243194970750. Its totient is φ = 243194970748.

The previous prime is 243194970737. The next prime is 243194970827. The reversal of 243194970749 is 947079491342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143711502649 + 99483468100 = 379093^2 + 315410^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243194970749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243194972749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121597485374 + 121597485375.

It is an arithmetic number, because the mean of its divisors is an integer number (121597485375).

Almost surely, 2^243194970749 is an apocalyptic number.

It is an amenable number.

243194970749 is a deficient number, since it is larger than the sum of its proper divisors (1).

243194970749 is an equidigital number, since it uses as much as digits as its factorization.

243194970749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13716864, while the sum is 59.

The spelling of 243194970749 in words is "two hundred forty-three billion, one hundred ninety-four million, nine hundred seventy thousand, seven hundred forty-nine".