641017 has 6 divisors (see below), whose sum is σ = 694302. Its totient is φ = 591552.

The previous prime is 640993. The next prime is 641051. The reversal of 641017 is 710146.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 18496 + 622521 = 136^2 + 789^2 .

It is a de Polignac number, because none of the positive numbers 2^k-641017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 640985 and 641003.

It is not an unprimeable number, because it can be changed into a prime (641057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1728 + ... + 2065.

It is an arithmetic number, because the mean of its divisors is an integer number (115717).

2⁶⁴¹⁰¹⁷ is an apocalyptic number.

It is an amenable number.

641017 is a deficient number, since it is larger than the sum of its proper divisors (53285).

641017 is a wasteful number, since it uses less digits than its factorization.

641017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3819 (or 3806 counting only the distinct ones).

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

The square root of 641017 is about 800.6353726885. The cubic root of 641017 is about 86.2230105289.

It can be divided in two parts, 64 and 1017, that added together give a triangular number (1081 = T₄₆).

The spelling of 641017 in words is "six hundred forty-one thousand, seventeen".