133881361 has 2 divisors, whose sum is σ = 133881362. Its totient is φ = 133881360.

The previous prime is 133881337. The next prime is 133881373. The reversal of 133881361 is 163188331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88736400 + 45144961 = 9420^2 + 6719^2 .

It is an emirp because it is prime and its reverse (163188331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133881361 - 2¹⁵ = 133848593 is a prime.

It is not a weakly prime, because it can be changed into another prime (133881311) 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, 66940680 + 66940681.

It is an arithmetic number, because the mean of its divisors is an integer number (66940681).

Almost surely, 2^133881361 is an apocalyptic number.

It is an amenable number.

133881361 is a deficient number, since it is larger than the sum of its proper divisors (1).

133881361 is an equidigital number, since it uses as much as digits as its factorization.

133881361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 34.

The square root of 133881361 is about 11570.7113437334. The cubic root of 133881361 is about 511.5719294421.

The spelling of 133881361 in words is "one hundred thirty-three million, eight hundred eighty-one thousand, three hundred sixty-one".