181198201 has 4 divisors (see below), whose sum is σ = 181226404. Its totient is φ = 181170000.

The previous prime is 181198169. The next prime is 181198249. The reversal of 181198201 is 102891181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 102891181 = 41 ⋅2509541.

It can be written as a sum of positive squares in 2 ways, for example, as 82791801 + 98406400 = 9099^2 + 9920^2 .

It is a cyclic number.

It is not a de Polignac number, because 181198201 - 2⁵ = 181198169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181192201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 751 + ... + 19051.

It is an arithmetic number, because the mean of its divisors is an integer number (45306601).

Almost surely, 2^181198201 is an apocalyptic number.

It is an amenable number.

181198201 is a deficient number, since it is larger than the sum of its proper divisors (28203).

181198201 is an equidigital number, since it uses as much as digits as its factorization.

181198201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28202.

The product of its (nonzero) digits is 1152, while the sum is 31.

The square root of 181198201 is about 13460.9881138050. The cubic root of 181198201 is about 565.8716813414.

The spelling of 181198201 in words is "one hundred eighty-one million, one hundred ninety-eight thousand, two hundred one".