133853609 has 2 divisors, whose sum is σ = 133853610. Its totient is φ = 133853608.

The previous prime is 133853557. The next prime is 133853611. The reversal of 133853609 is 906358331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105124009 + 28729600 = 10253^2 + 5360^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133853609 is a prime.

Together with 133853611, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (133853639) 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, 66926804 + 66926805.

It is an arithmetic number, because the mean of its divisors is an integer number (66926805).

Almost surely, 2^133853609 is an apocalyptic number.

It is an amenable number.

133853609 is a deficient number, since it is larger than the sum of its proper divisors (1).

133853609 is an equidigital number, since it uses as much as digits as its factorization.

133853609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 133853609 is about 11569.5120467546. The cubic root of 133853609 is about 511.5365794249.

The spelling of 133853609 in words is "one hundred thirty-three million, eight hundred fifty-three thousand, six hundred nine".