189999901001 has 2 divisors, whose sum is σ = 189999901002. Its totient is φ = 189999901000.

The previous prime is 189999900997. The next prime is 189999901033. The reversal of 189999901001 is 100109999981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 184856142601 + 5143758400 = 429949^2 + 71720^2 .

It is an emirp because it is prime and its reverse (100109999981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189999901001 - 2² = 189999900997 is a prime.

It is not a weakly prime, because it can be changed into another prime (189999906001) 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, 94999950500 + 94999950501.

It is an arithmetic number, because the mean of its divisors is an integer number (94999950501).

Almost surely, 2^189999901001 is an apocalyptic number.

It is an amenable number.

189999901001 is a deficient number, since it is larger than the sum of its proper divisors (1).

189999901001 is an equidigital number, since it uses as much as digits as its factorization.

189999901001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 472392, while the sum is 56.

The spelling of 189999901001 in words is "one hundred eighty-nine billion, nine hundred ninety-nine million, nine hundred one thousand, one".