243172040773 has 2 divisors, whose sum is σ = 243172040774. Its totient is φ = 243172040772.

The previous prime is 243172040753. The next prime is 243172040843. The reversal of 243172040773 is 377040271342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210477253284 + 32694787489 = 458778^2 + 180817^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243172040773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243172040723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121586020386 + 121586020387.

It is an arithmetic number, because the mean of its divisors is an integer number (121586020387).

Almost surely, 2^243172040773 is an apocalyptic number.

It is an amenable number.

243172040773 is a deficient number, since it is larger than the sum of its proper divisors (1).

243172040773 is an equidigital number, since it uses as much as digits as its factorization.

243172040773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 197568, while the sum is 40.

The spelling of 243172040773 in words is "two hundred forty-three billion, one hundred seventy-two million, forty thousand, seven hundred seventy-three".