15601 has 2 divisors, whose sum is σ = 15602.
Its totient is φ = 15600.
The previous prime is 15583. The next prime is 15607. The reversal of 15601 is 10651.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 15376 + 225 = 124^2 + 15^2
It is an emirp because it is prime and its reverse (10651) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 15601 - 25 = 15569 is a prime.
It is not a weakly prime, because it can be changed into another prime (15607) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7800 + 7801.
It is an arithmetic number, because the mean of its divisors is an integer number (7801).
215601 is an apocalyptic number.
It is an amenable number.
15601 is a deficient number, since it is larger than the sum of its proper divisors (1).
15601 is an equidigital number, since it uses as much as digits as its factorization.
15601 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 30, while the sum is 13.
The square root of 15601 is about 124.9039631077.
The cubic root of 15601 is about 24.9871934408.
Subtracting from 15601 its reverse (10651), we obtain a triangular number (4950 = T99).
It can be divided in two parts, 15 and 601, that added together give a palindrome (616).
The spelling of 15601 in words is "fifteen thousand, six hundred one".