641071 has 4 divisors (see below), whose sum is σ = 642712. Its totient is φ = 639432.

The previous prime is 641057. The next prime is 641077. The reversal of 641071 is 170146.

It is a happy number.

641071 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 641071 - 2⁷ = 640943 is a prime.

It is a Duffinian number.

641071 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641077) 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, 145 + ... + 1141.

It is an arithmetic number, because the mean of its divisors is an integer number (160678).

2⁶⁴¹⁰⁷¹ is an apocalyptic number.

641071 is a deficient number, since it is larger than the sum of its proper divisors (1641).

641071 is an equidigital number, since it uses as much as digits as its factorization.

641071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1640.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 641071 is about 800.6690951948. The cubic root of 641071 is about 86.2254316357.

The spelling of 641071 in words is "six hundred forty-one thousand, seventy-one".