133406281 has 2 divisors, whose sum is σ = 133406282. Its totient is φ = 133406280.

The previous prime is 133406269. The next prime is 133406291. The reversal of 133406281 is 182604331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133194681 + 211600 = 11541^2 + 460^2 .

It is a cyclic number.

It is not a de Polignac number, because 133406281 - 2¹⁹ = 132881993 is a prime.

It is a super-2 number, since 2×133406281² = 35594471620501922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (133406291) 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, 66703140 + 66703141.

It is an arithmetic number, because the mean of its divisors is an integer number (66703141).

Almost surely, 2^133406281 is an apocalyptic number.

It is an amenable number.

133406281 is a deficient number, since it is larger than the sum of its proper divisors (1).

133406281 is an equidigital number, since it uses as much as digits as its factorization.

133406281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 133406281 is about 11550.1636784939. The cubic root of 133406281 is about 510.9661054184.

The spelling of 133406281 in words is "one hundred thirty-three million, four hundred six thousand, two hundred eighty-one".