133128323 has 4 divisors (see below), whose sum is σ = 133152768. Its totient is φ = 133103880.

The previous prime is 133128319. The next prime is 133128389. The reversal of 133128323 is 323821331.

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 133128323 - 2² = 133128319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 133128292 and 133128301.

It is not an unprimeable number, because it can be changed into a prime (133128823) 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, 65 + ... + 16317.

It is an arithmetic number, because the mean of its divisors is an integer number (33288192).

Almost surely, 2^133128323 is an apocalyptic number.

133128323 is a deficient number, since it is larger than the sum of its proper divisors (24445).

133128323 is an equidigital number, since it uses as much as digits as its factorization.

133128323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24444.

The product of its digits is 2592, while the sum is 26.

The square root of 133128323 is about 11538.1247609826. The cubic root of 133128323 is about 510.6109850298.

Adding to 133128323 its reverse (323821331), we get a palindrome (456949654).

The spelling of 133128323 in words is "one hundred thirty-three million, one hundred twenty-eight thousand, three hundred twenty-three".