133803809 has 2 divisors, whose sum is σ = 133803810. Its totient is φ = 133803808.

The previous prime is 133803773. The next prime is 133803823. The reversal of 133803809 is 908308331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68840209 + 64963600 = 8297^2 + 8060^2 .

It is a cyclic number.

It is not a de Polignac number, because 133803809 - 2¹⁶ = 133738273 is a prime.

It is not a weakly prime, because it can be changed into another prime (133803899) 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, 66901904 + 66901905.

It is an arithmetic number, because the mean of its divisors is an integer number (66901905).

Almost surely, 2^133803809 is an apocalyptic number.

It is an amenable number.

133803809 is a deficient number, since it is larger than the sum of its proper divisors (1).

133803809 is an equidigital number, since it uses as much as digits as its factorization.

133803809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 133803809 is about 11567.3596382234. The cubic root of 133803809 is about 511.4731327940.

The spelling of 133803809 in words is "one hundred thirty-three million, eight hundred three thousand, eight hundred nine".