133128265 has 8 divisors (see below), whose sum is σ = 161679168. Its totient is φ = 105219120.

The previous prime is 133128253. The next prime is 133128319. The reversal of 133128265 is 562821331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 133128265 - 2¹⁵ = 133095497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159981 + ... + 160810.

It is an arithmetic number, because the mean of its divisors is an integer number (20209896).

Almost surely, 2^133128265 is an apocalyptic number.

It is an amenable number.

133128265 is a deficient number, since it is larger than the sum of its proper divisors (28550903).

133128265 is an equidigital number, since it uses as much as digits as its factorization.

133128265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320879.

The product of its digits is 8640, while the sum is 31.

The square root of 133128265 is about 11538.1222475756. The cubic root of 133128265 is about 510.6109108772.

Adding to 133128265 its reverse (562821331), we get a palindrome (695949596).

The spelling of 133128265 in words is "one hundred thirty-three million, one hundred twenty-eight thousand, two hundred sixty-five".