133643 has 4 divisors (see below), whose sum is σ = 135000. Its totient is φ = 132288.

The previous prime is 133633. The next prime is 133649. The reversal of 133643 is 346331.

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 133643 - 2⁸ = 133387 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 518 + ... + 731.

It is an arithmetic number, because the mean of its divisors is an integer number (33750).

2¹³³⁶⁴³ is an apocalyptic number.

133643 is a deficient number, since it is larger than the sum of its proper divisors (1357).

133643 is a wasteful number, since it uses less digits than its factorization.

133643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1356.

The product of its digits is 648, while the sum is 20.

The square root of 133643 is about 365.5721543006. The cubic root of 133643 is about 51.1268149953.

Adding to 133643 its reverse (346331), we get a palindrome (479974).

The spelling of 133643 in words is "one hundred thirty-three thousand, six hundred forty-three".