133928509 has 32 divisors (see below), whose sum is σ = 164602368. Its totient is φ = 107328000.

The previous prime is 133928503. The next prime is 133928513. The reversal of 133928509 is 905829331.

It is not a de Polignac number, because 133928509 - 2⁵ = 133928477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133928503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 310524 + ... + 310954.

It is an arithmetic number, because the mean of its divisors is an integer number (5143824).

Almost surely, 2^133928509 is an apocalyptic number.

It is an amenable number.

133928509 is a deficient number, since it is larger than the sum of its proper divisors (30673859).

133928509 is a wasteful number, since it uses less digits than its factorization.

133928509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 133928509 is about 11572.7485499340. The cubic root of 133928509 is about 511.6319745506.

The spelling of 133928509 in words is "one hundred thirty-three million, nine hundred twenty-eight thousand, five hundred nine".