653623 has 2 divisors, whose sum is σ = 653624. Its totient is φ = 653622.

The previous prime is 653621. The next prime is 653641. The reversal of 653623 is 326356.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 653623 - 2¹ = 653621 is a prime.

It is a super-2 number, since 2×653623² = 854446052258, which contains 22 as substring.

Together with 653621, it forms a pair of twin primes.

It is equal to p₅₃₀₈₉ and since 653623 and 53089 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (653621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 326811 + 326812.

It is an arithmetic number, because the mean of its divisors is an integer number (326812).

2⁶⁵³⁶²³ is an apocalyptic number.

653623 is a deficient number, since it is larger than the sum of its proper divisors (1).

653623 is an equidigital number, since it uses as much as digits as its factorization.

653623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 25.

The square root of 653623 is about 808.4695417887. The cubic root of 653623 is about 86.7845552167.

Adding to 653623 its reverse (326356), we get a palindrome (979979).

The spelling of 653623 in words is "six hundred fifty-three thousand, six hundred twenty-three".