641671 has 4 divisors (see below), whose sum is σ = 653832. Its totient is φ = 629512.

The previous prime is 641639. The next prime is 641681. The reversal of 641671 is 176146.

It is a happy number.

641671 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

641671 is an esthetic number in base 3, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 641671 - 2⁵ = 641639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6001 + ... + 6106.

It is an arithmetic number, because the mean of its divisors is an integer number (163458).

2⁶⁴¹⁶⁷¹ is an apocalyptic number.

641671 is a deficient number, since it is larger than the sum of its proper divisors (12161).

641671 is a wasteful number, since it uses less digits than its factorization.

641671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12160.

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

The square root of 641671 is about 801.0436941890. The cubic root of 641671 is about 86.2523236789.

The spelling of 641671 in words is "six hundred forty-one thousand, six hundred seventy-one".