133391305 has 24 divisors (see below), whose sum is σ = 171614592. Its totient is φ = 99497376.

The previous prime is 133391303. The next prime is 133391317. The reversal of 133391305 is 503193331.

It is not a de Polignac number, because 133391305 - 2¹ = 133391303 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133391303) 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 23 ways as a sum of consecutive naturals, for example, 120384 + ... + 121486.

It is an arithmetic number, because the mean of its divisors is an integer number (7150608).

Almost surely, 2^133391305 is an apocalyptic number.

It is an amenable number.

133391305 is a deficient number, since it is larger than the sum of its proper divisors (38223287).

133391305 is a wasteful number, since it uses less digits than its factorization.

133391305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213 (or 1194 counting only the distinct ones).

The product of its (nonzero) digits is 3645, while the sum is 28.

The square root of 133391305 is about 11549.5153577975. The cubic root of 133391305 is about 510.9469845926.

The spelling of 133391305 in words is "one hundred thirty-three million, three hundred ninety-one thousand, three hundred five".