15973 has 2 divisors, whose sum is σ = 15974.
Its totient is φ = 15972.
The previous prime is 15971. The next prime is 15991. The reversal of 15973 is 37951.
It can be divided in two parts, 1597 and 3, that added together give a square (1600 = 402).
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 14884 + 1089 = 122^2 + 33^2
It is an emirp because it is prime and its reverse (37951) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 15973 - 21 = 15971 is a prime.
Together with 15971, it forms a pair of twin primes.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (15971) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7986 + 7987.
It is an arithmetic number, because the mean of its divisors is an integer number (7987).
215973 is an apocalyptic number.
It is an amenable number.
15973 is a deficient number, since it is larger than the sum of its proper divisors (1).
15973 is an equidigital number, since it uses as much as digits as its factorization.
15973 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 945, while the sum is 25.
The square root of 15973 is about 126.3843344723.
The cubic root of 15973 is about 25.1842389057.
The spelling of 15973 in words is "fifteen thousand, nine hundred seventy-three".