133860809 has 2 divisors, whose sum is σ = 133860810. Its totient is φ = 133860808.

The previous prime is 133860791. The next prime is 133860827. The reversal of 133860809 is 908068331.

It is a balanced prime because it is at equal distance from previous prime (133860791) and next prime (133860827).

It can be written as a sum of positive squares in only one way, i.e., 131171209 + 2689600 = 11453^2 + 1640^2 .

It is an emirp because it is prime and its reverse (908068331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133860809 - 2⁸ = 133860553 is a prime.

It is a super-2 number, since 2×133860809² = 35837432372268962, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (133860509) 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, 66930404 + 66930405.

It is an arithmetic number, because the mean of its divisors is an integer number (66930405).

Almost surely, 2^133860809 is an apocalyptic number.

It is an amenable number.

133860809 is a deficient number, since it is larger than the sum of its proper divisors (1).

133860809 is an equidigital number, since it uses as much as digits as its factorization.

133860809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 133860809 is about 11569.8232052180. The cubic root of 133860809 is about 511.5457511296.

The spelling of 133860809 in words is "one hundred thirty-three million, eight hundred sixty thousand, eight hundred nine".