642171 has 8 divisors (see below), whose sum is σ = 866880. Its totient is φ = 422792.

The previous prime is 642163. The next prime is 642197. The reversal of 642171 is 171246.

642171 is nontrivially palindromic in base 7.

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 642171 - 2³ = 642163 is a prime.

It is a d-powerful number, because it can be written as 6³ + 4² + 1 + 2¹⁹ + 7⁶ + 1 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 642171.

It is not an unprimeable number, because it can be changed into a prime (642121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1041 + ... + 1538.

It is an arithmetic number, because the mean of its divisors is an integer number (108360).

2⁶⁴²¹⁷¹ is an apocalyptic number.

642171 is a deficient number, since it is larger than the sum of its proper divisors (224709).

642171 is a wasteful number, since it uses less digits than its factorization.

642171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2665.

The product of its digits is 336, while the sum is 21.

The square root of 642171 is about 801.3557262540. The cubic root of 642171 is about 86.2747209122.

The spelling of 642171 in words is "six hundred forty-two thousand, one hundred seventy-one".