133386691 has 2 divisors, whose sum is σ = 133386692. Its totient is φ = 133386690.

The previous prime is 133386667. The next prime is 133386697. The reversal of 133386691 is 196683331.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 133386691 - 2⁷ = 133386563 is a prime.

It is equal to p_7559248 and since 133386691 and 7559248 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (133386697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66693345 + 66693346.

It is an arithmetic number, because the mean of its divisors is an integer number (66693346).

Almost surely, 2^133386691 is an apocalyptic number.

133386691 is a deficient number, since it is larger than the sum of its proper divisors (1).

133386691 is an equidigital number, since it uses as much as digits as its factorization.

133386691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 40.

The square root of 133386691 is about 11549.3156074289. The cubic root of 133386691 is about 510.9410933127.

The spelling of 133386691 in words is "one hundred thirty-three million, three hundred eighty-six thousand, six hundred ninety-one".