189573297281 has 2 divisors, whose sum is σ = 189573297282. Its totient is φ = 189573297280.

The previous prime is 189573297257. The next prime is 189573297299. The reversal of 189573297281 is 182792375981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105229520881 + 84343776400 = 324391^2 + 290420^2 .

It is an emirp because it is prime and its reverse (182792375981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189573297281 - 2⁶ = 189573297217 is a prime.

It is a super-2 number, since 2×189573297281² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (189573297211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94786648640 + 94786648641.

It is an arithmetic number, because the mean of its divisors is an integer number (94786648641).

Almost surely, 2^189573297281 is an apocalyptic number.

It is an amenable number.

189573297281 is a deficient number, since it is larger than the sum of its proper divisors (1).

189573297281 is an equidigital number, since it uses as much as digits as its factorization.

189573297281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15240960, while the sum is 62.

The spelling of 189573297281 in words is "one hundred eighty-nine billion, five hundred seventy-three million, two hundred ninety-seven thousand, two hundred eighty-one".