198075181 has 2 divisors, whose sum is σ = 198075182. Its totient is φ = 198075180.

The previous prime is 198075167. The next prime is 198075187. The reversal of 198075181 is 181570891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189612900 + 8462281 = 13770^2 + 2909^2 .

It is an emirp because it is prime and its reverse (181570891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198075181 - 2¹⁵ = 198042413 is a prime.

It is a super-2 number, since 2×198075181² = 78467554656365522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198075187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99037590 + 99037591.

It is an arithmetic number, because the mean of its divisors is an integer number (99037591).

Almost surely, 2^198075181 is an apocalyptic number.

It is an amenable number.

198075181 is a deficient number, since it is larger than the sum of its proper divisors (1).

198075181 is an equidigital number, since it uses as much as digits as its factorization.

198075181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 40.

The square root of 198075181 is about 14073.9184664400. The cubic root of 198075181 is about 582.9214284694.

The spelling of 198075181 in words is "one hundred ninety-eight million, seventy-five thousand, one hundred eighty-one".