641511 has 12 divisors (see below), whose sum is σ = 998088. Its totient is φ = 394704.

The previous prime is 641491. The next prime is 641513. The reversal of 641511 is 115146.

It is not a de Polignac number, because 641511 - 2⁵ = 641479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641513) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2625 + ... + 2858.

It is an arithmetic number, because the mean of its divisors is an integer number (83174).

2⁶⁴¹⁵¹¹ is an apocalyptic number.

641511 is a deficient number, since it is larger than the sum of its proper divisors (356577).

641511 is a wasteful number, since it uses less digits than its factorization.

641511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5502 (or 5499 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 641511 is about 800.9438182544. The cubic root of 641511 is about 86.2451541071.

Adding to 641511 its reverse (115146), we get a palindrome (756657).

The spelling of 641511 in words is "six hundred forty-one thousand, five hundred eleven".