641136 has 60 divisors (see below), whose sum is σ = 1795272. Its totient is φ = 196992.

The previous prime is 641131. The next prime is 641143. The reversal of 641136 is 631146.

It is a super-2 number, since 2×641136² = 822110740992, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641131) by changing a digit.

641136 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17310 + ... + 17346.

2⁶⁴¹¹³⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (897636).

641136 is an abundant number, since it is smaller than the sum of its proper divisors (1154136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

641136 is a wasteful number, since it uses less digits than its factorization.

641136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86 (or 61 counting only the distinct ones).

The product of its digits is 432, while the sum is 21.

The square root of 641136 is about 800.7096852168. The cubic root of 641136 is about 86.2283457506.

It can be divided in two parts, 641 and 136, that added together give a palindrome (777).

The spelling of 641136 in words is "six hundred forty-one thousand, one hundred thirty-six".