220640171 has 2 divisors, whose sum is σ = 220640172. Its totient is φ = 220640170.

The previous prime is 220640159. The next prime is 220640191. The reversal of 220640171 is 171046022.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 220640171 - 2¹⁰ = 220639147 is a prime.

It is not a weakly prime, because it can be changed into another prime (220640191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110320085 + 110320086.

It is an arithmetic number, because the mean of its divisors is an integer number (110320086).

Almost surely, 2^220640171 is an apocalyptic number.

220640171 is a deficient number, since it is larger than the sum of its proper divisors (1).

220640171 is an equidigital number, since it uses as much as digits as its factorization.

220640171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 220640171 is about 14853.9614581431. The cubic root of 220640171 is about 604.2660507602.

Adding to 220640171 its reverse (171046022), we get a palindrome (391686193).

The spelling of 220640171 in words is "two hundred twenty million, six hundred forty thousand, one hundred seventy-one".