653503 has 2 divisors, whose sum is σ = 653504. Its totient is φ = 653502.

The previous prime is 653501. The next prime is 653507. The reversal of 653503 is 305356.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 653503 - 2¹ = 653501 is a prime.

Together with 653501, 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 (653501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 326751 + 326752.

It is an arithmetic number, because the mean of its divisors is an integer number (326752).

2⁶⁵³⁵⁰³ is an apocalyptic number.

653503 is a deficient number, since it is larger than the sum of its proper divisors (1).

653503 is an equidigital number, since it uses as much as digits as its factorization.

653503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1350, while the sum is 22.

The square root of 653503 is about 808.3953240835. The cubic root of 653503 is about 86.7792439062.

Adding to 653503 its reverse (305356), we get a palindrome (958859).

It can be divided in two parts, 653 and 503, that added together give a square (1156 = 34²).

The spelling of 653503 in words is "six hundred fifty-three thousand, five hundred three".