133506239 has 2 divisors, whose sum is σ = 133506240. Its totient is φ = 133506238.

The previous prime is 133506229. The next prime is 133506251. The reversal of 133506239 is 932605331.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133506239 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133506229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66753119 + 66753120.

It is an arithmetic number, because the mean of its divisors is an integer number (66753120).

Almost surely, 2^133506239 is an apocalyptic number.

133506239 is a deficient number, since it is larger than the sum of its proper divisors (1).

133506239 is an equidigital number, since it uses as much as digits as its factorization.

133506239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 32.

The square root of 133506239 is about 11554.4899930720. The cubic root of 133506239 is about 511.0936916121.

The spelling of 133506239 in words is "one hundred thirty-three million, five hundred six thousand, two hundred thirty-nine".