133345523 has 4 divisors (see below), whose sum is σ = 135172248. Its totient is φ = 131518800.

The previous prime is 133345519. The next prime is 133345543. The reversal of 133345523 is 325543331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 325543331 = 53 ⋅6142327.

It is a cyclic number.

It is not a de Polignac number, because 133345523 - 2² = 133345519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133345543) 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, 913253 + ... + 913398.

It is an arithmetic number, because the mean of its divisors is an integer number (33793062).

Almost surely, 2^133345523 is an apocalyptic number.

133345523 is a deficient number, since it is larger than the sum of its proper divisors (1826725).

133345523 is an equidigital number, since it uses as much as digits as its factorization.

133345523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1826724.

The product of its digits is 16200, while the sum is 29.

The square root of 133345523 is about 11547.5331997791. The cubic root of 133345523 is about 510.8885228822. Note that the first 3 decimals are identical.

Adding to 133345523 its reverse (325543331), we get a palindrome (458888854).

The spelling of 133345523 in words is "one hundred thirty-three million, three hundred forty-five thousand, five hundred twenty-three".