189985001 has 2 divisors, whose sum is σ = 189985002. Its totient is φ = 189985000.

The previous prime is 189984997. The next prime is 189985039. The reversal of 189985001 is 100589981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150307600 + 39677401 = 12260^2 + 6299^2 .

It is a cyclic number.

It is not a de Polignac number, because 189985001 - 2² = 189984997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 189985001.

It is not a weakly prime, because it can be changed into another prime (189955001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94992500 + 94992501.

It is an arithmetic number, because the mean of its divisors is an integer number (94992501).

Almost surely, 2^189985001 is an apocalyptic number.

It is an amenable number.

189985001 is a deficient number, since it is larger than the sum of its proper divisors (1).

189985001 is an equidigital number, since it uses as much as digits as its factorization.

189985001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 41.

The square root of 189985001 is about 13783.5046704385. The cubic root of 189985001 is about 574.8745798285.

The spelling of 189985001 in words is "one hundred eighty-nine million, nine hundred eighty-five thousand, one".