133544521 has 16 divisors (see below), whose sum is σ = 155471040. Its totient is φ = 113425920.

The previous prime is 133544519. The next prime is 133544533. The reversal of 133544521 is 125445331.

It is a cyclic number.

It is not a de Polignac number, because 133544521 - 2¹ = 133544519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133544521.

It is not an unprimeable number, because it can be changed into a prime (133574521) 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 15 ways as a sum of consecutive naturals, for example, 10881 + ... + 19633.

It is an arithmetic number, because the mean of its divisors is an integer number (9716940).

Almost surely, 2^133544521 is an apocalyptic number.

133544521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

133544521 is a deficient number, since it is larger than the sum of its proper divisors (21926519).

133544521 is a wasteful number, since it uses less digits than its factorization.

133544521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8856.

The product of its digits is 7200, while the sum is 28.

The square root of 133544521 is about 11556.1464597849. The cubic root of 133544521 is about 511.1425378159.

Adding to 133544521 its reverse (125445331), we get a palindrome (258989852).

The spelling of 133544521 in words is "one hundred thirty-three million, five hundred forty-four thousand, five hundred twenty-one".