133809901 has 2 divisors, whose sum is σ = 133809902. Its totient is φ = 133809900.

The previous prime is 133809889. The next prime is 133809911. The reversal of 133809901 is 109908331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118592100 + 15217801 = 10890^2 + 3901^2 .

It is a cyclic number.

It is not a de Polignac number, because 133809901 - 2⁵ = 133809869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133809911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66904950 + 66904951.

It is an arithmetic number, because the mean of its divisors is an integer number (66904951).

Almost surely, 2^133809901 is an apocalyptic number.

It is an amenable number.

133809901 is a deficient number, since it is larger than the sum of its proper divisors (1).

133809901 is an equidigital number, since it uses as much as digits as its factorization.

133809901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 133809901 is about 11567.6229623895. The cubic root of 133809901 is about 511.4808950221.

The spelling of 133809901 in words is "one hundred thirty-three million, eight hundred nine thousand, nine hundred one".