646171 has 8 divisors (see below), whose sum is σ = 691200. Its totient is φ = 602280.

The previous prime is 646169. The next prime is 646181. The reversal of 646171 is 171646.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 646171 - 2¹ = 646169 is a prime.

It is a super-2 number, since 2×646171² = 835073922482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646181) 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 in 7 ways as a sum of consecutive naturals, for example, 1110 + ... + 1588.

It is an arithmetic number, because the mean of its divisors is an integer number (86400).

2⁶⁴⁶¹⁷¹ is an apocalyptic number.

646171 is a deficient number, since it is larger than the sum of its proper divisors (45029).

646171 is a wasteful number, since it uses less digits than its factorization.

646171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569.

The product of its digits is 1008, while the sum is 25.

The square root of 646171 is about 803.8476223763. The cubic root of 646171 is about 86.4534816200.

The spelling of 646171 in words is "six hundred forty-six thousand, one hundred seventy-one".