It is a happy number.
15641 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.
It is a strong prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-15641 is a prime.
It is a Chen prime.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 15641.
15641 is a Friedman number, since it can be written as 5^6+(1+1)^4, using all its digits and the basic arithmetic operations.
215641 is an apocalyptic number.
It is an amenable number.
15641 is an equidigital number, since it uses as much as digits as its factorization.
15641 is an evil number, because the sum of its binary digits is even.
The square root of 15641 is about 125.0639836244. The cubic root of 15641 is about 25.0085304223.
Subtracting from 15641 its reverse (14651), we obtain a triangular number (990 = T44).
The spelling of 15641 in words is "fifteen thousand, six hundred forty-one".