133647 has 4 divisors (see below), whose sum is σ = 178200. Its totient is φ = 89096.

The previous prime is 133633. The next prime is 133649. The reversal of 133647 is 746331.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 133647 - 2⁴ = 133631 is a prime.

It is a D-number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 133647.

It is not an unprimeable number, because it can be changed into a prime (133649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22272 + ... + 22277.

It is an arithmetic number, because the mean of its divisors is an integer number (44550).

2¹³³⁶⁴⁷ is an apocalyptic number.

133647 is a deficient number, since it is larger than the sum of its proper divisors (44553).

133647 is an equidigital number, since it uses as much as digits as its factorization.

133647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44552.

The product of its digits is 1512, while the sum is 24.

The square root of 133647 is about 365.5776251359. The cubic root of 133647 is about 51.1273250736.

Adding to 133647 its reverse (746331), we get a palindrome (879978).

It can be divided in two parts, 133 and 647, that added together give a triangular number (780 = T₃₉).

The spelling of 133647 in words is "one hundred thirty-three thousand, six hundred forty-seven".