133309973 has 4 divisors (see below), whose sum is σ = 133692300. Its totient is φ = 132927648.

The previous prime is 133309963. The next prime is 133309987. The reversal of 133309973 is 379903331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 379903331 = 409 ⋅928859.

It can be written as a sum of positive squares in 2 ways, for example, as 104387089 + 28922884 = 10217^2 + 5378^2 .

It is a cyclic number.

It is not a de Polignac number, because 133309973 - 2²⁰ = 132261397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133309963) 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, 190640 + ... + 191337.

It is an arithmetic number, because the mean of its divisors is an integer number (33423075).

Almost surely, 2^133309973 is an apocalyptic number.

It is an amenable number.

133309973 is a deficient number, since it is larger than the sum of its proper divisors (382327).

133309973 is an equidigital number, since it uses as much as digits as its factorization.

133309973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382326.

The product of its (nonzero) digits is 45927, while the sum is 38.

The square root of 133309973 is about 11545.9938073775. The cubic root of 133309973 is about 510.8431177802.

The spelling of 133309973 in words is "one hundred thirty-three million, three hundred nine thousand, nine hundred seventy-three".