43553 has 4 divisors (see below), whose sum is σ = 44100. Its totient is φ = 43008.

The previous prime is 43543. The next prime is 43573. The reversal of 43553 is 35534.

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

It can be written as a sum of positive squares in 2 ways, for example, as 23104 + 20449 = 152^2 + 143^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43553 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (43543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128 + ... + 321.

It is an arithmetic number, because the mean of its divisors is an integer number (11025).

2⁴³⁵⁵³ is an apocalyptic number.

It is an amenable number.

43553 is a deficient number, since it is larger than the sum of its proper divisors (547).

43553 is an equidigital number, since it uses as much as digits as its factorization.

43553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546.

The product of its digits is 900, while the sum is 20.

The square root of 43553 is about 208.6935552431. The cubic root of 43553 is about 35.1835257793.

The spelling of 43553 in words is "forty-three thousand, five hundred fifty-three".