133538291 has 8 divisors (see below), whose sum is σ = 139081824. Its totient is φ = 128096640.

The previous prime is 133538269. The next prime is 133538311. The reversal of 133538291 is 192835331.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 133538291 - 2¹⁴ = 133521907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133538201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22790 + ... + 28043.

It is an arithmetic number, because the mean of its divisors is an integer number (17385228).

Almost surely, 2^133538291 is an apocalyptic number.

133538291 is a deficient number, since it is larger than the sum of its proper divisors (5543533).

133538291 is an equidigital number, since it uses as much as digits as its factorization.

133538291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50941.

The product of its digits is 19440, while the sum is 35.

The square root of 133538291 is about 11555.8769031173. The cubic root of 133538291 is about 511.1345892369.

The spelling of 133538291 in words is "one hundred thirty-three million, five hundred thirty-eight thousand, two hundred ninety-one".