133866613 has 2 divisors, whose sum is σ = 133866614. Its totient is φ = 133866612.

The previous prime is 133866589. The next prime is 133866617. The reversal of 133866613 is 316668331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91068849 + 42797764 = 9543^2 + 6542^2 .

It is a cyclic number.

It is not a de Polignac number, because 133866613 - 2¹⁷ = 133735541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133866617) 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, 66933306 + 66933307.

It is an arithmetic number, because the mean of its divisors is an integer number (66933307).

Almost surely, 2^133866613 is an apocalyptic number.

It is an amenable number.

133866613 is a deficient number, since it is larger than the sum of its proper divisors (1).

133866613 is an equidigital number, since it uses as much as digits as its factorization.

133866613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 37.

The square root of 133866613 is about 11570.0740274209. The cubic root of 133866613 is about 511.5531443033.

The spelling of 133866613 in words is "one hundred thirty-three million, eight hundred sixty-six thousand, six hundred thirteen".