189919001 has 2 divisors, whose sum is σ = 189919002. Its totient is φ = 189919000.

The previous prime is 189918991. The next prime is 189919013. The reversal of 189919001 is 100919981.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185613376 + 4305625 = 13624^2 + 2075^2 .

It is a cyclic number.

It is not a de Polignac number, because 189919001 - 2¹⁴ = 189902617 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (189919031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94959500 + 94959501.

It is an arithmetic number, because the mean of its divisors is an integer number (94959501).

Almost surely, 2^189919001 is an apocalyptic number.

It is an amenable number.

189919001 is a deficient number, since it is larger than the sum of its proper divisors (1).

189919001 is an equidigital number, since it uses as much as digits as its factorization.

189919001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 38.

The square root of 189919001 is about 13781.1102963441. The cubic root of 189919001 is about 574.8080024381.

The spelling of 189919001 in words is "one hundred eighty-nine million, nine hundred nineteen thousand, one".