628171 has 2 divisors, whose sum is σ = 628172. Its totient is φ = 628170.

The previous prime is 628139. The next prime is 628183. The reversal of 628171 is 171826.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 628171 - 2⁵ = 628139 is a prime.

It is not a weakly prime, because it can be changed into another prime (620171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314085 + 314086.

It is an arithmetic number, because the mean of its divisors is an integer number (314086).

2⁶²⁸¹⁷¹ is an apocalyptic number.

628171 is a deficient number, since it is larger than the sum of its proper divisors (1).

628171 is an equidigital number, since it uses as much as digits as its factorization.

628171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 25.

The square root of 628171 is about 792.5723941698. The cubic root of 628171 is about 85.6431490468.

Adding to 628171 its reverse (171826), we get a palindrome (799997).

The spelling of 628171 in words is "six hundred twenty-eight thousand, one hundred seventy-one".