133448509 has 2 divisors, whose sum is σ = 133448510. Its totient is φ = 133448508.

The previous prime is 133448449. The next prime is 133448527. The reversal of 133448509 is 905844331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77528025 + 55920484 = 8805^2 + 7478^2 .

It is a cyclic number.

It is not a de Polignac number, because 133448509 - 2¹¹ = 133446461 is a prime.

It is equal to p_7562593 and since 133448509 and 7562593 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133448009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66724254 + 66724255.

It is an arithmetic number, because the mean of its divisors is an integer number (66724255).

Almost surely, 2^133448509 is an apocalyptic number.

It is an amenable number.

133448509 is a deficient number, since it is larger than the sum of its proper divisors (1).

133448509 is an equidigital number, since it uses as much as digits as its factorization.

133448509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 133448509 is about 11551.9915599000. The cubic root of 133448509 is about 511.0200129263.

The spelling of 133448509 in words is "one hundred thirty-three million, four hundred forty-eight thousand, five hundred nine".