215503 has 2 divisors, whose sum is σ = 215504. Its totient is φ = 215502.

The previous prime is 215497. The next prime is 215507. The reversal of 215503 is 305512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215503 - 2⁵ = 215471 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215507) 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, 107751 + 107752.

It is an arithmetic number, because the mean of its divisors is an integer number (107752).

2²¹⁵⁵⁰³ is an apocalyptic number.

215503 is a deficient number, since it is larger than the sum of its proper divisors (1).

215503 is an equidigital number, since it uses as much as digits as its factorization.

215503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 150, while the sum is 16.

The square root of 215503 is about 464.2230067543. The cubic root of 215503 is about 59.9539461412.

Subtracting 215503 from its reverse (305512), we obtain a palindrome (90009).

The spelling of 215503 in words is "two hundred fifteen thousand, five hundred three".