133566061 has 2 divisors, whose sum is σ = 133566062. Its totient is φ = 133566060.

The previous prime is 133566053. The next prime is 133566071. The reversal of 133566061 is 160665331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117614025 + 15952036 = 10845^2 + 3994^2 .

It is a cyclic number.

It is not a de Polignac number, because 133566061 - 2³ = 133566053 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 (133566071) 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, 66783030 + 66783031.

It is an arithmetic number, because the mean of its divisors is an integer number (66783031).

Almost surely, 2^133566061 is an apocalyptic number.

It is an amenable number.

133566061 is a deficient number, since it is larger than the sum of its proper divisors (1).

133566061 is an equidigital number, since it uses as much as digits as its factorization.

133566061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 133566061 is about 11557.0783937810. The cubic root of 133566061 is about 511.1700178360.

The spelling of 133566061 in words is "one hundred thirty-three million, five hundred sixty-six thousand, sixty-one".