133205531 has 2 divisors, whose sum is σ = 133205532. Its totient is φ = 133205530.

The previous prime is 133205503. The next prime is 133205533. The reversal of 133205531 is 135502331.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 133205531 - 2⁶ = 133205467 is a prime.

It is a super-2 number, since 2×133205531² = 35487426977983922, which contains 22 as substring.

Together with 133205533, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 133205497 and 133205506.

It is not a weakly prime, because it can be changed into another prime (133205533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66602765 + 66602766.

It is an arithmetic number, because the mean of its divisors is an integer number (66602766).

Almost surely, 2^133205531 is an apocalyptic number.

133205531 is a deficient number, since it is larger than the sum of its proper divisors (1).

133205531 is an equidigital number, since it uses as much as digits as its factorization.

133205531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1350, while the sum is 23.

The square root of 133205531 is about 11541.4700536803. The cubic root of 133205531 is about 510.7096758601.

Adding to 133205531 its reverse (135502331), we get a palindrome (268707862).

The spelling of 133205531 in words is "one hundred thirty-three million, two hundred five thousand, five hundred thirty-one".