653603 has 4 divisors (see below), whose sum is σ = 656040. Its totient is φ = 651168.

The previous prime is 653593. The next prime is 653617. The reversal of 653603 is 306356.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 653603 - 2⁶ = 653539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (653623) 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 in 3 ways as a sum of consecutive naturals, for example, 758 + ... + 1371.

It is an arithmetic number, because the mean of its divisors is an integer number (164010).

2⁶⁵³⁶⁰³ is an apocalyptic number.

653603 is a deficient number, since it is larger than the sum of its proper divisors (2437).

653603 is a wasteful number, since it uses less digits than its factorization.

653603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2436.

The product of its (nonzero) digits is 1620, while the sum is 23.

The square root of 653603 is about 808.4571726443. The cubic root of 653603 is about 86.7836700434.

Adding to 653603 its reverse (306356), we get a palindrome (959959).

The spelling of 653603 in words is "six hundred fifty-three thousand, six hundred three".