133209673 has 4 divisors (see below), whose sum is σ = 137803140. Its totient is φ = 128616208.

The previous prime is 133209653. The next prime is 133209679. The reversal of 133209673 is 376902331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 376902331 = 13 ⋅28992487.

It can be written as a sum of positive squares in 2 ways, for example, as 48330304 + 84879369 = 6952^2 + 9213^2 .

It is a cyclic number.

It is not a de Polignac number, because 133209673 - 2⁵ = 133209641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133209679) 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, 2296690 + ... + 2296747.

It is an arithmetic number, because the mean of its divisors is an integer number (34450785).

Almost surely, 2^133209673 is an apocalyptic number.

It is an amenable number.

133209673 is a deficient number, since it is larger than the sum of its proper divisors (4593467).

133209673 is an equidigital number, since it uses as much as digits as its factorization.

133209673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4593466.

The product of its (nonzero) digits is 20412, while the sum is 34.

The square root of 133209673 is about 11541.6494921653. The cubic root of 133209673 is about 510.7149692778.

The spelling of 133209673 in words is "one hundred thirty-three million, two hundred nine thousand, six hundred seventy-three".