133312891 has 2 divisors, whose sum is σ = 133312892. Its totient is φ = 133312890.

The previous prime is 133312867. The next prime is 133312931. The reversal of 133312891 is 198213331.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 133312891 - 2⁷ = 133312763 is a prime.

It is not a weakly prime, because it can be changed into another prime (133312831) 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 as a sum of consecutive naturals, namely, 66656445 + 66656446.

It is an arithmetic number, because the mean of its divisors is an integer number (66656446).

Almost surely, 2^133312891 is an apocalyptic number.

133312891 is a deficient number, since it is larger than the sum of its proper divisors (1).

133312891 is an equidigital number, since it uses as much as digits as its factorization.

133312891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 31.

The square root of 133312891 is about 11546.1201708626. The cubic root of 133312891 is about 510.8468450065.

The spelling of 133312891 in words is "one hundred thirty-three million, three hundred twelve thousand, eight hundred ninety-one".