133923509 has 2 divisors, whose sum is σ = 133923510. Its totient is φ = 133923508.

The previous prime is 133923497. The next prime is 133923541. The reversal of 133923509 is 905329331.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72301009 + 61622500 = 8503^2 + 7850^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133923509 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133923709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66961754 + 66961755.

It is an arithmetic number, because the mean of its divisors is an integer number (66961755).

Almost surely, 2^133923509 is an apocalyptic number.

It is an amenable number.

133923509 is a deficient number, since it is larger than the sum of its proper divisors (1).

133923509 is an equidigital number, since it uses as much as digits as its factorization.

133923509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21870, while the sum is 35.

The square root of 133923509 is about 11572.5325231775. The cubic root of 133923509 is about 511.6256074928.

The spelling of 133923509 in words is "one hundred thirty-three million, nine hundred twenty-three thousand, five hundred nine".