133545 has 16 divisors (see below), whose sum is σ = 221760. Its totient is φ = 68544.

The previous prime is 133543. The next prime is 133559. The reversal of 133545 is 545331.

It is not a de Polignac number, because 133545 - 2¹ = 133543 is a prime.

It is an Ulam number.

133545 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (133541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 282 + ... + 588.

It is an arithmetic number, because the mean of its divisors is an integer number (13860).

2¹³³⁵⁴⁵ is an apocalyptic number.

133545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

133545 is a deficient number, since it is larger than the sum of its proper divisors (88215).

133545 is a wasteful number, since it uses less digits than its factorization.

133545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344.

The product of its digits is 900, while the sum is 21.

The square root of 133545 is about 365.4380932525. The cubic root of 133545 is about 51.1143148940.

Adding to 133545 its reverse (545331), we get a palindrome (678876).

The spelling of 133545 in words is "one hundred thirty-three thousand, five hundred forty-five".