133968691 has 2 divisors, whose sum is σ = 133968692. Its totient is φ = 133968690.

The previous prime is 133968641. The next prime is 133968697. The reversal of 133968691 is 196869331.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 133968691 - 2¹³ = 133960499 is a prime.

It is a super-2 number, since 2×133968691² = 35895220336506962, which contains 22 as substring.

It is a zygodrome in base 2.

It is not a weakly prime, because it can be changed into another prime (133968697) 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, 66984345 + 66984346.

It is an arithmetic number, because the mean of its divisors is an integer number (66984346).

Almost surely, 2^133968691 is an apocalyptic number.

133968691 is a deficient number, since it is larger than the sum of its proper divisors (1).

133968691 is an equidigital number, since it uses as much as digits as its factorization.

133968691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952, while the sum is 46.

The square root of 133968691 is about 11574.4844809607. The cubic root of 133968691 is about 511.6831370215.

The spelling of 133968691 in words is "one hundred thirty-three million, nine hundred sixty-eight thousand, six hundred ninety-one".