133649 has 2 divisors, whose sum is σ = 133650. Its totient is φ = 133648.

The previous prime is 133633. The next prime is 133657. The reversal of 133649 is 946331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67600 + 66049 = 260^2 + 257^2 .

It is an emirp because it is prime and its reverse (946331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133649 - 2⁴ = 133633 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (133669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66824 + 66825.

It is an arithmetic number, because the mean of its divisors is an integer number (66825).

2¹³³⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

133649 is a deficient number, since it is larger than the sum of its proper divisors (1).

133649 is an equidigital number, since it uses as much as digits as its factorization.

133649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 26.

The square root of 133649 is about 365.5803605228. The cubic root of 133649 is about 51.1275801090.

The spelling of 133649 in words is "one hundred thirty-three thousand, six hundred forty-nine".