15803 has 2 divisors, whose sum is σ = 15804. Its totient is φ = 15802.

The previous prime is 15797. The next prime is 15809. The reversal of 15803 is 30851.

It is a balanced prime because it is at equal distance from previous prime (15797) and next prime (15809).

It is an emirp because it is prime and its reverse (30851) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15803 - 2⁴ = 15787 is a prime.

It is a Sophie Germain prime.

It is equal to p₁₈₄₄ and since 15803 and 1844 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (15809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7901 + 7902.

It is an arithmetic number, because the mean of its divisors is an integer number (7902).

2¹⁵⁸⁰³ is an apocalyptic number.

15803 is a deficient number, since it is larger than the sum of its proper divisors (1).

15803 is an equidigital number, since it uses as much as digits as its factorization.

15803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 15803 is about 125.7099836926. The cubic root of 15803 is about 25.0945751042.

It can be divided in two parts, 15 and 803, that added together give a palindrome (818).

The spelling of 15803 in words is "fifteen thousand, eight hundred three".