243555081193 has 2 divisors, whose sum is σ = 243555081194. Its totient is φ = 243555081192.

The previous prime is 243555081167. The next prime is 243555081229. The reversal of 243555081193 is 391180555342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139724197209 + 103830883984 = 373797^2 + 322228^2 .

It is a cyclic number.

It is not a de Polignac number, because 243555081193 - 2¹³ = 243555073001 is a prime.

It is not a weakly prime, because it can be changed into another prime (243555081293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121777540596 + 121777540597.

It is an arithmetic number, because the mean of its divisors is an integer number (121777540597).

Almost surely, 2^243555081193 is an apocalyptic number.

It is an amenable number.

243555081193 is a deficient number, since it is larger than the sum of its proper divisors (1).

243555081193 is an equidigital number, since it uses as much as digits as its factorization.

243555081193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648000, while the sum is 46.

The spelling of 243555081193 in words is "two hundred forty-three billion, five hundred fifty-five million, eighty-one thousand, one hundred ninety-three".