133109909 has 2 divisors, whose sum is σ = 133109910. Its totient is φ = 133109908.

The previous prime is 133109803. The next prime is 133109917. The reversal of 133109909 is 909901331.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90820900 + 42289009 = 9530^2 + 6503^2 .

It is an emirp because it is prime and its reverse (909901331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133109909 - 2¹² = 133105813 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133109929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66554954 + 66554955.

It is an arithmetic number, because the mean of its divisors is an integer number (66554955).

Almost surely, 2^133109909 is an apocalyptic number.

It is an amenable number.

133109909 is a deficient number, since it is larger than the sum of its proper divisors (1).

133109909 is an equidigital number, since it uses as much as digits as its factorization.

133109909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6561, while the sum is 35.

The square root of 133109909 is about 11537.3267700971. The cubic root of 133109909 is about 510.5874417697.

The spelling of 133109909 in words is "one hundred thirty-three million, one hundred nine thousand, nine hundred nine".