641155 has 16 divisors (see below), whose sum is σ = 859680. Its totient is φ = 456192.

The previous prime is 641143. The next prime is 641167. The reversal of 641155 is 551146.

It is an interprime number because it is at equal distance from previous prime (641143) and next prime (641167).

It is a cyclic number.

It is not a de Polignac number, because 641155 - 2¹⁹ = 116867 is a prime.

It is a super-2 number, since 2×641155² = 822159468050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1417 + ... + 1813.

It is an arithmetic number, because the mean of its divisors is an integer number (53730).

2⁶⁴¹¹⁵⁵ is an apocalyptic number.

641155 is a deficient number, since it is larger than the sum of its proper divisors (218525).

641155 is a wasteful number, since it uses less digits than its factorization.

641155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438.

The product of its digits is 600, while the sum is 22.

The square root of 641155 is about 800.7215496039. The cubic root of 641155 is about 86.2291975316.

Subtracting from 641155 its reverse (551146), we obtain a palindrome (90009).

It can be divided in two parts, 64 and 1155, that multiplied together give a triangular number (73920 = T₃₈₄).

The spelling of 641155 in words is "six hundred forty-one thousand, one hundred fifty-five".