646271 has 2 divisors, whose sum is σ = 646272. Its totient is φ = 646270.

The previous prime is 646267. The next prime is 646273. The reversal of 646271 is 172646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 646271 - 2² = 646267 is a prime.

Together with 646273, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 646271.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323135 + 323136.

It is an arithmetic number, because the mean of its divisors is an integer number (323136).

2⁶⁴⁶²⁷¹ is an apocalyptic number.

646271 is a deficient number, since it is larger than the sum of its proper divisors (1).

646271 is an equidigital number, since it uses as much as digits as its factorization.

646271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 26.

The square root of 646271 is about 803.9098208133. The cubic root of 646271 is about 86.4579411734.

The spelling of 646271 in words is "six hundred forty-six thousand, two hundred seventy-one".