23553 has 6 divisors (see below), whose sum is σ = 34034.
Its totient is φ = 15696.
The previous prime is 23549. The next prime is 23557. The reversal of 23553 is 35532.
It can be divided in two parts, 23 and 553, that added together give a square (576 = 242).
It is an interprime number because it is at equal distance from previous prime (23549) and next prime (23557).
It can be written as a sum of positive squares in only one way, i.e., 23409 + 144 = 153^2 + 12^2
It is not a de Polignac number, because 23553 - 22 = 23549 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (23557) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (5) of ones.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1300 + ... + 1317.
It is a Proth number, since it is equal to 23 ⋅ 210 + 1 and 23 < 210.
223553 is an apocalyptic number.
It is an amenable number.
23553 is a deficient number, since it is larger than the sum of its proper divisors (10481).
23553 is a wasteful number, since it uses less digits than its factorization.
23553 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2623 (or 2620 counting only the distinct ones).
The product of its digits is 450, while the sum is 18.
The square root of 23553 is about 153.4698667491.
The cubic root of 23553 is about 28.6647886517.
The spelling of 23553 in words is "twenty-three thousand, five hundred fifty-three".