133268809 has 2 divisors, whose sum is σ = 133268810. Its totient is φ = 133268808.

The previous prime is 133268801. The next prime is 133268879. The reversal of 133268809 is 908862331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73051209 + 60217600 = 8547^2 + 7760^2 .

It is a cyclic number.

It is not a de Polignac number, because 133268809 - 2³ = 133268801 is a prime.

It is not a weakly prime, because it can be changed into another prime (133268801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66634404 + 66634405.

It is an arithmetic number, because the mean of its divisors is an integer number (66634405).

Almost surely, 2^133268809 is an apocalyptic number.

It is an amenable number.

133268809 is a deficient number, since it is larger than the sum of its proper divisors (1).

133268809 is an equidigital number, since it uses as much as digits as its factorization.

133268809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 133268809 is about 11544.2110600941. The cubic root of 133268809 is about 510.7905322899.

The spelling of 133268809 in words is "one hundred thirty-three million, two hundred sixty-eight thousand, eight hundred nine".