133243305 has 16 divisors (see below), whose sum is σ = 229588800. Its totient is φ = 65596608.

The previous prime is 133243289. The next prime is 133243307. The reversal of 133243305 is 503342331.

It is a happy number.

It is not a de Polignac number, because 133243305 - 2⁴ = 133243289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133243307) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 341455 + ... + 341844.

It is an arithmetic number, because the mean of its divisors is an integer number (14349300).

Almost surely, 2^133243305 is an apocalyptic number.

133243305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

133243305 is a deficient number, since it is larger than the sum of its proper divisors (96345495).

133243305 is a wasteful number, since it uses less digits than its factorization.

133243305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683320.

The product of its (nonzero) digits is 3240, while the sum is 24.

The square root of 133243305 is about 11543.1063843317. The cubic root of 133243305 is about 510.7579464384.

Adding to 133243305 its reverse (503342331), we get a palindrome (636585636).

The spelling of 133243305 in words is "one hundred thirty-three million, two hundred forty-three thousand, three hundred five".