133508385 has 16 divisors (see below), whose sum is σ = 237348480. Its totient is φ = 71204400.

The previous prime is 133508377. The next prime is 133508387. The reversal of 133508385 is 583805331.

It is not a de Polignac number, because 133508385 - 2³ = 133508377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133508387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 494341 + ... + 494610.

It is an arithmetic number, because the mean of its divisors is an integer number (14834280).

Almost surely, 2^133508385 is an apocalyptic number.

133508385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

133508385 is a deficient number, since it is larger than the sum of its proper divisors (103840095).

133508385 is an equidigital number, since it uses as much as digits as its factorization.

133508385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988965 (or 988959 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 133508385 is about 11554.5828570312. The cubic root of 133508385 is about 511.0964300639.

The spelling of 133508385 in words is "one hundred thirty-three million, five hundred eight thousand, three hundred eighty-five".