133445553 has 8 divisors (see below), whose sum is σ = 178009248. Its totient is φ = 88922784.

The previous prime is 133445509. The next prime is 133445567. The reversal of 133445553 is 355544331.

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

It is not a de Polignac number, because 133445553 - 2⁹ = 133445041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133449553) 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 7 ways as a sum of consecutive naturals, for example, 1575 + ... + 16412.

It is an arithmetic number, because the mean of its divisors is an integer number (22251156).

Almost surely, 2^133445553 is an apocalyptic number.

It is an amenable number.

133445553 is a deficient number, since it is larger than the sum of its proper divisors (44563695).

133445553 is a wasteful number, since it uses less digits than its factorization.

133445553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20463.

The product of its digits is 54000, while the sum is 33.

The square root of 133445553 is about 11551.8636158847. The cubic root of 133445553 is about 511.0162397199.

Adding to 133445553 its reverse (355544331), we get a palindrome (488989884).

The spelling of 133445553 in words is "one hundred thirty-three million, four hundred forty-five thousand, five hundred fifty-three".