133445509 has 2 divisors, whose sum is σ = 133445510. Its totient is φ = 133445508.

The previous prime is 133445497. The next prime is 133445567. The reversal of 133445509 is 905544331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100440484 + 33005025 = 10022^2 + 5745^2 .

It is a cyclic number.

It is not a de Polignac number, because 133445509 - 2⁷ = 133445381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133445579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66722754 + 66722755.

It is an arithmetic number, because the mean of its divisors is an integer number (66722755).

Almost surely, 2^133445509 is an apocalyptic number.

It is an amenable number.

133445509 is a deficient number, since it is larger than the sum of its proper divisors (1).

133445509 is an equidigital number, since it uses as much as digits as its factorization.

133445509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 133445509 is about 11551.8617114299. The cubic root of 133445509 is about 511.0161835554.

The spelling of 133445509 in words is "one hundred thirty-three million, four hundred forty-five thousand, five hundred nine".