201898189 has 2 divisors, whose sum is σ = 201898190. Its totient is φ = 201898188.

The previous prime is 201898183. The next prime is 201898211. The reversal of 201898189 is 981898102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135606025 + 66292164 = 11645^2 + 8142^2 .

It is a cyclic number.

It is not a de Polignac number, because 201898189 - 2³ = 201898181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201898181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100949094 + 100949095.

It is an arithmetic number, because the mean of its divisors is an integer number (100949095).

Almost surely, 2^201898189 is an apocalyptic number.

It is an amenable number.

201898189 is a deficient number, since it is larger than the sum of its proper divisors (1).

201898189 is an equidigital number, since it uses as much as digits as its factorization.

201898189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 46.

The square root of 201898189 is about 14209.0882536495. The cubic root of 201898189 is about 586.6478379732.

The spelling of 201898189 in words is "two hundred one million, eight hundred ninety-eight thousand, one hundred eighty-nine".