641771 has 4 divisors (see below), whose sum is σ = 691152. Its totient is φ = 592392.

The previous prime is 641761. The next prime is 641789. The reversal of 641771 is 177146.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641771 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 641771.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 641771.

It is not an unprimeable number, because it can be changed into a prime (641701) 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, 24671 + ... + 24696.

It is an arithmetic number, because the mean of its divisors is an integer number (172788).

2⁶⁴¹⁷⁷¹ is an apocalyptic number.

641771 is a deficient number, since it is larger than the sum of its proper divisors (49381).

641771 is a wasteful number, since it uses less digits than its factorization.

641771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49380.

The product of its digits is 1176, while the sum is 26.

The square root of 641771 is about 801.1061103250. The cubic root of 641771 is about 86.2568040561.

The spelling of 641771 in words is "six hundred forty-one thousand, seven hundred seventy-one".