263503 has 2 divisors, whose sum is σ = 263504. Its totient is φ = 263502.

The previous prime is 263491. The next prime is 263513. The reversal of 263503 is 305362.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-263503 is a prime.

It is a d-powerful number, because it can be written as 2¹³ + 6² + 5⁷ + 3 + 0 + 3¹¹ .

263503 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131751 + 131752.

It is an arithmetic number, because the mean of its divisors is an integer number (131752).

2²⁶³⁵⁰³ is an apocalyptic number.

263503 is a deficient number, since it is larger than the sum of its proper divisors (1).

263503 is an equidigital number, since it uses as much as digits as its factorization.

263503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 19.

The square root of 263503 is about 513.3254328396. The cubic root of 263503 is about 64.1104051359.

Adding to 263503 its reverse (305362), we get a palindrome (568865).

The spelling of 263503 in words is "two hundred sixty-three thousand, five hundred three".