641465 has 16 divisors (see below), whose sum is σ = 855360. Its totient is φ = 457920.

The previous prime is 641453. The next prime is 641467. The reversal of 641465 is 564146.

641465 = 18² + 19² + ... + 124².

It is a happy number.

It is not a de Polignac number, because 641465 - 2¹² = 637369 is a prime.

It is a super-2 number, since 2×641465² = 822954692450, which contains 22 as substring.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (641467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5831 + ... + 5939.

It is an arithmetic number, because the mean of its divisors is an integer number (53460).

2⁶⁴¹⁴⁶⁵ is an apocalyptic number.

It is an amenable number.

641465 is a deficient number, since it is larger than the sum of its proper divisors (213895).

641465 is a wasteful number, since it uses less digits than its factorization.

641465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232.

The product of its digits is 2880, while the sum is 26.

The square root of 641465 is about 800.9151016181. The cubic root of 641465 is about 86.2430926345.

The spelling of 641465 in words is "six hundred forty-one thousand, four hundred sixty-five".