133009391 has 4 divisors (see below), whose sum is σ = 138792432. Its totient is φ = 127226352.

The previous prime is 133009381. The next prime is 133009397. The reversal of 133009391 is 193900331.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 133009391 - 2¹⁰ = 133008367 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 (133009397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2891486 + ... + 2891531.

It is an arithmetic number, because the mean of its divisors is an integer number (34698108).

Almost surely, 2^133009391 is an apocalyptic number.

133009391 is a deficient number, since it is larger than the sum of its proper divisors (5783041).

133009391 is an equidigital number, since it uses as much as digits as its factorization.

133009391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5783040.

The product of its (nonzero) digits is 2187, while the sum is 29.

The square root of 133009391 is about 11532.9697389701. The cubic root of 133009391 is about 510.4588859690.

The spelling of 133009391 in words is "one hundred thirty-three million, nine thousand, three hundred ninety-one".