133688449 has 2 divisors, whose sum is σ = 133688450. Its totient is φ = 133688448.

The previous prime is 133688431. The next prime is 133688473. The reversal of 133688449 is 944886331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116316225 + 17372224 = 10785^2 + 4168^2 .

It is a cyclic number.

It is not a de Polignac number, because 133688449 - 2²¹ = 131591297 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 133688399 and 133688408.

It is not a weakly prime, because it can be changed into another prime (133688479) 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, 66844224 + 66844225.

It is an arithmetic number, because the mean of its divisors is an integer number (66844225).

Almost surely, 2^133688449 is an apocalyptic number.

It is an amenable number.

133688449 is a deficient number, since it is larger than the sum of its proper divisors (1).

133688449 is an equidigital number, since it uses as much as digits as its factorization.

133688449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 497664, while the sum is 46.

The square root of 133688449 is about 11562.3721182117. The cubic root of 133688449 is about 511.3261003442.

The spelling of 133688449 in words is "one hundred thirty-three million, six hundred eighty-eight thousand, four hundred forty-nine".