189945601 has 2 divisors, whose sum is σ = 189945602. Its totient is φ = 189945600.

The previous prime is 189945599. The next prime is 189945611. The reversal of 189945601 is 106549981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178249201 + 11696400 = 13351^2 + 3420^2 .

It is a cyclic number.

It is not a de Polignac number, because 189945601 - 2¹ = 189945599 is a prime.

Together with 189945599, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (189945611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94972800 + 94972801.

It is an arithmetic number, because the mean of its divisors is an integer number (94972801).

Almost surely, 2^189945601 is an apocalyptic number.

It is an amenable number.

189945601 is a deficient number, since it is larger than the sum of its proper divisors (1).

189945601 is an equidigital number, since it uses as much as digits as its factorization.

189945601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 189945601 is about 13782.0753517023. The cubic root of 189945601 is about 574.8348369992.

The spelling of 189945601 in words is "one hundred eighty-nine million, nine hundred forty-five thousand, six hundred one".