243555081169 has 9 divisors (see below), whose sum is σ = 246716575497. Its totient is φ = 240433611444.

The previous prime is 243555081167. The next prime is 243555081193. The reversal of 243555081169 is 961180555342.

The square root of 243555081169 is 493513.

It is a perfect power (a square), and thus also a powerful number.

243555081169 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 243555081169 - 2¹ = 243555081167 is a prime.

It is a super-2 number, since 2×243555081169² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243555081167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 38984404 + ... + 38990650.

It is an arithmetic number, because the mean of its divisors is an integer number (27412952833).

Almost surely, 2^243555081169 is an apocalyptic number.

243555081169 is the 493513-rd square number.

243555081169 is the 246757-th centered octagonal number.

It is an amenable number.

243555081169 is a deficient number, since it is larger than the sum of its proper divisors (3161494328).

243555081169 is an frugal number, since it uses more digits than its factorization.

243555081169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12652 (or 6326 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 49.

Multiplying 243555081169 by its sum of digits (49), we get a square (11934198977281 = 3454591²).

The spelling of 243555081169 in words is "two hundred forty-three billion, five hundred fifty-five million, eighty-one thousand, one hundred sixty-nine".