171998201 has 2 divisors, whose sum is σ = 171998202. Its totient is φ = 171998200.

The previous prime is 171998171. The next prime is 171998207. The reversal of 171998201 is 102899171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160782400 + 11215801 = 12680^2 + 3349^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171998201 is a prime.

It is a super-2 number, since 2×171998201² = 59166762294472802, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (171998207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85999100 + 85999101.

It is an arithmetic number, because the mean of its divisors is an integer number (85999101).

Almost surely, 2^171998201 is an apocalyptic number.

It is an amenable number.

171998201 is a deficient number, since it is larger than the sum of its proper divisors (1).

171998201 is an equidigital number, since it uses as much as digits as its factorization.

171998201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 38.

The square root of 171998201 is about 13114.8084621927. The cubic root of 171998201 is about 556.1278377355.

The spelling of 171998201 in words is "one hundred seventy-one million, nine hundred ninety-eight thousand, two hundred one".