133228265 has 4 divisors (see below), whose sum is σ = 159873924. Its totient is φ = 106582608.

The previous prime is 133228241. The next prime is 133228267. The reversal of 133228265 is 562822331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 562822331 = 661 ⋅851471.

It can be written as a sum of positive squares in 2 ways, for example, as 38204761 + 95023504 = 6181^2 + 9748^2 .

It is a cyclic number.

It is not a de Polignac number, because 133228265 - 2²⁶ = 66119401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133228267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13322822 + ... + 13322831.

It is an arithmetic number, because the mean of its divisors is an integer number (39968481).

Almost surely, 2^133228265 is an apocalyptic number.

It is an amenable number.

133228265 is a deficient number, since it is larger than the sum of its proper divisors (26645659).

133228265 is an equidigital number, since it uses as much as digits as its factorization.

133228265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26645658.

The product of its digits is 17280, while the sum is 32.

The square root of 133228265 is about 11542.4548948653. The cubic root of 133228265 is about 510.7387282406.

The spelling of 133228265 in words is "one hundred thirty-three million, two hundred twenty-eight thousand, two hundred sixty-five".