128533 has 4 divisors (see below), whose sum is σ = 130240. Its totient is φ = 126828.

The previous prime is 128521. The next prime is 128549. The reversal of 128533 is 335821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 128533 - 2⁹ = 128021 is a prime.

It is a Duffinian number.

128533 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128563) 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, 735 + ... + 892.

It is an arithmetic number, because the mean of its divisors is an integer number (32560).

2¹²⁸⁵³³ is an apocalyptic number.

It is an amenable number.

128533 is a deficient number, since it is larger than the sum of its proper divisors (1707).

128533 is an equidigital number, since it uses as much as digits as its factorization.

128533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1706.

The product of its digits is 720, while the sum is 22.

The square root of 128533 is about 358.5149927130. The cubic root of 128533 is about 50.4666969918.

The spelling of 128533 in words is "one hundred twenty-eight thousand, five hundred thirty-three".