193640484889 has 2 divisors, whose sum is σ = 193640484890. Its totient is φ = 193640484888.

The previous prime is 193640484887. The next prime is 193640484931. The reversal of 193640484889 is 988484046391.

193640484889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150404352400 + 43236132489 = 387820^2 + 207933^2 .

It is a cyclic number.

It is not a de Polignac number, because 193640484889 - 2¹ = 193640484887 is a prime.

Together with 193640484887, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 193640484889.

It is not a weakly prime, because it can be changed into another prime (193640484887) 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 as a sum of consecutive naturals, namely, 96820242444 + 96820242445.

It is an arithmetic number, because the mean of its divisors is an integer number (96820242445).

Almost surely, 2^193640484889 is an apocalyptic number.

It is an amenable number.

193640484889 is a deficient number, since it is larger than the sum of its proper divisors (1).

193640484889 is an equidigital number, since it uses as much as digits as its factorization.

193640484889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47775744, while the sum is 64.

The spelling of 193640484889 in words is "one hundred ninety-three billion, six hundred forty million, four hundred eighty-four thousand, eight hundred eighty-nine".