133504551 has 32 divisors (see below), whose sum is σ = 205920000. Its totient is φ = 85415904.

The previous prime is 133504541. The next prime is 133504633. The reversal of 133504551 is 155405331.

It is not a de Polignac number, because 133504551 - 2⁹ = 133504039 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133504531) 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 31 ways as a sum of consecutive naturals, for example, 67525 + ... + 69473.

It is an arithmetic number, because the mean of its divisors is an integer number (6435000).

Almost surely, 2^133504551 is an apocalyptic number.

133504551 is a deficient number, since it is larger than the sum of its proper divisors (72415449).

133504551 is a wasteful number, since it uses less digits than its factorization.

133504551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2060 (or 2054 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 133504551 is about 11554.4169476439. The cubic root of 133504551 is about 511.0915375810.

Adding to 133504551 its reverse (155405331), we get a palindrome (288909882).

The spelling of 133504551 in words is "one hundred thirty-three million, five hundred four thousand, five hundred fifty-one".