133305523 has 12 divisors (see below), whose sum is σ = 144919600. Its totient is φ = 121893552.

The previous prime is 133305511. The next prime is 133305533. The reversal of 133305523 is 325503331.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-133305523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133305503) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 587136 + ... + 587362.

Almost surely, 2^133305523 is an apocalyptic number.

133305523 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

133305523 is a deficient number, since it is larger than the sum of its proper divisors (11614077).

133305523 is an equidigital number, since it uses as much as digits as its factorization.

133305523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666 (or 439 counting only the distinct ones).

The product of its (nonzero) digits is 4050, while the sum is 25.

The square root of 133305523 is about 11545.8010982348. The cubic root of 133305523 is about 510.8374335914.

Adding to 133305523 its reverse (325503331), we get a palindrome (458808854).

The spelling of 133305523 in words is "one hundred thirty-three million, three hundred five thousand, five hundred twenty-three".