189809201 has 2 divisors, whose sum is σ = 189809202. Its totient is φ = 189809200.

The previous prime is 189809189. The next prime is 189809231. The reversal of 189809201 is 102908981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178249201 + 11560000 = 13351^2 + 3400^2 .

It is a cyclic number.

It is not a de Polignac number, because 189809201 - 2¹⁴ = 189792817 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (189809231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94904600 + 94904601.

It is an arithmetic number, because the mean of its divisors is an integer number (94904601).

Almost surely, 2^189809201 is an apocalyptic number.

It is an amenable number.

189809201 is a deficient number, since it is larger than the sum of its proper divisors (1).

189809201 is an equidigital number, since it uses as much as digits as its factorization.

189809201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 189809201 is about 13777.1260065371. The cubic root of 189809201 is about 574.6972076867.

The spelling of 189809201 in words is "one hundred eighty-nine million, eight hundred nine thousand, two hundred one".