133239539 has 2 divisors, whose sum is σ = 133239540. Its totient is φ = 133239538.

The previous prime is 133239517. The next prime is 133239541. The reversal of 133239539 is 935932331.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 133239539 - 2⁸ = 133239283 is a prime.

Together with 133239541, 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 (133239569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66619769 + 66619770.

It is an arithmetic number, because the mean of its divisors is an integer number (66619770).

Almost surely, 2^133239539 is an apocalyptic number.

133239539 is a deficient number, since it is larger than the sum of its proper divisors (1).

133239539 is an equidigital number, since it uses as much as digits as its factorization.

133239539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 65610, while the sum is 38.

The square root of 133239539 is about 11542.9432555133. The cubic root of 133239539 is about 510.7531343579.

The spelling of 133239539 in words is "one hundred thirty-three million, two hundred thirty-nine thousand, five hundred thirty-nine".