641000641 has 8 divisors (see below), whose sum is σ = 648422568. Its totient is φ = 633600000.

The previous prime is 641000599. The next prime is 641000681. The reversal of 641000641 is 146000146.

641000641 = T₂₈₈ + T₂₈₉ + ... + T₁₅₆₉.

It can be written as a sum of positive squares in 4 ways, for example, as 561879616 + 79121025 = 23704^2 + 8895^2 .

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 641000641 - 2¹⁷ = 640869569 is a prime.

It is a super-3 number, since 3×641000641³ (a number of 27 digits) contains 333 as substring.

It is a deceptive number, since it divides R_641000640.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641000681) 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 7 ways as a sum of consecutive naturals, for example, 59791 + ... + 69691.

It is an arithmetic number, because the mean of its divisors is an integer number (81052821).

Almost surely, 2^641000641 is an apocalyptic number.

It is an amenable number.

641000641 is a deficient number, since it is larger than the sum of its proper divisors (7421927).

641000641 is a wasteful number, since it uses less digits than its factorization.

641000641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10643.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 641000641 is about 25317.9904613301. The cubic root of 641000641 is about 862.2227704122. Note that the first 3 decimals are identical.

Adding to 641000641 its reverse (146000146), we get a palindrome (787000787).

The spelling of 641000641 in words is "six hundred forty-one million, six hundred forty-one", and thus it is an aban number.