171440201 has 2 divisors, whose sum is σ = 171440202. Its totient is φ = 171440200.

The previous prime is 171440167. The next prime is 171440231. The reversal of 171440201 is 102044171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167676601 + 3763600 = 12949^2 + 1940^2 .

It is an emirp because it is prime and its reverse (102044171) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171440201 is a prime.

It is not a weakly prime, because it can be changed into another prime (171440231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85720100 + 85720101.

It is an arithmetic number, because the mean of its divisors is an integer number (85720101).

Almost surely, 2^171440201 is an apocalyptic number.

It is an amenable number.

171440201 is a deficient number, since it is larger than the sum of its proper divisors (1).

171440201 is an equidigital number, since it uses as much as digits as its factorization.

171440201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 171440201 is about 13093.5175182225. The cubic root of 171440201 is about 555.5257858552.

Adding to 171440201 its reverse (102044171), we get a palindrome (273484372).

The spelling of 171440201 in words is "one hundred seventy-one million, four hundred forty thousand, two hundred one".