641597 has 16 divisors (see below), whose sum is σ = 767232. Its totient is φ = 529920.

The previous prime is 641581. The next prime is 641623. The reversal of 641597 is 795146.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 641597 - 2⁴ = 641581 is a prime.

It is a super-3 number, since 3×641597³ = 792333883374849519, which contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641197) 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, 8753 + ... + 8825.

It is an arithmetic number, because the mean of its divisors is an integer number (47952).

2⁶⁴¹⁵⁹⁷ is an apocalyptic number.

It is an amenable number.

641597 is a deficient number, since it is larger than the sum of its proper divisors (125635).

641597 is a wasteful number, since it uses less digits than its factorization.

641597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148.

The product of its digits is 7560, while the sum is 32.

The square root of 641597 is about 800.9975031172. The cubic root of 641597 is about 86.2490079001.

It can be divided in two parts, 64 and 1597, that added together give a palindrome (1661).

The spelling of 641597 in words is "six hundred forty-one thousand, five hundred ninety-seven".