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133689 = 344563
BaseRepresentation
bin100000101000111001
320210101110
4200220321
513234224
62510533
71064523
oct405071
9223343
10133689
1191496
1265449
1348b0a
1436a13
1529929
hex20a39

133689 has 4 divisors (see below), whose sum is σ = 178256. Its totient is φ = 89124.

The previous prime is 133673. The next prime is 133691. The reversal of 133689 is 986331.

133689 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 986331 = 3328777.

It is not a de Polignac number, because 133689 - 24 = 133673 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

133689 is strictly pandigital in base 7.

133689 is a lucky number.

It is a plaindrome in base 10.

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, 22279 + ... + 22284.

It is an arithmetic number, because the mean of its divisors is an integer number (44564).

2133689 is an apocalyptic number.

It is an amenable number.

133689 is a deficient number, since it is larger than the sum of its proper divisors (44567).

133689 is an equidigital number, since it uses as much as digits as its factorization.

133689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44566.

The product of its digits is 3888, while the sum is 30.

The square root of 133689 is about 365.6350639641. The cubic root of 133689 is about 51.1326802824.

The spelling of 133689 in words is "one hundred thirty-three thousand, six hundred eighty-nine".

Divisors: 1 3 44563 133689