243578401373 has 2 divisors, whose sum is σ = 243578401374. Its totient is φ = 243578401372.

The previous prime is 243578401361. The next prime is 243578401387. The reversal of 243578401373 is 373104875342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122239039129 + 121339362244 = 349627^2 + 348338^2 .

It is a cyclic number.

It is not a de Polignac number, because 243578401373 - 2⁴ = 243578401357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243578406373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121789200686 + 121789200687.

It is an arithmetic number, because the mean of its divisors is an integer number (121789200687).

Almost surely, 2^243578401373 is an apocalyptic number.

It is an amenable number.

243578401373 is a deficient number, since it is larger than the sum of its proper divisors (1).

243578401373 is an equidigital number, since it uses as much as digits as its factorization.

243578401373 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1693440, while the sum is 47.

The spelling of 243578401373 in words is "two hundred forty-three billion, five hundred seventy-eight million, four hundred one thousand, three hundred seventy-three".