133508509 has 2 divisors, whose sum is σ = 133508510. Its totient is φ = 133508508.

The previous prime is 133508477. The next prime is 133508513. The reversal of 133508509 is 905805331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80946009 + 52562500 = 8997^2 + 7250^2 .

It is an emirp because it is prime and its reverse (905805331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133508509 - 2⁵ = 133508477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133508549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66754254 + 66754255.

It is an arithmetic number, because the mean of its divisors is an integer number (66754255).

Almost surely, 2^133508509 is an apocalyptic number.

It is an amenable number.

133508509 is a deficient number, since it is larger than the sum of its proper divisors (1).

133508509 is an equidigital number, since it uses as much as digits as its factorization.

133508509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 133508509 is about 11554.5882228663. The cubic root of 133508509 is about 511.0965882960.

The spelling of 133508509 in words is "one hundred thirty-three million, five hundred eight thousand, five hundred nine".