133499309 has 4 divisors (see below), whose sum is σ = 135491904. Its totient is φ = 131506716.

The previous prime is 133499279. The next prime is 133499341. The reversal of 133499309 is 903994331.

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: 903994331 = 19 ⋅47578649.

It is a cyclic number.

It is not a de Polignac number, because 133499309 - 2¹² = 133495213 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 (133499369) 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, 996197 + ... + 996330.

It is an arithmetic number, because the mean of its divisors is an integer number (33872976).

Almost surely, 2^133499309 is an apocalyptic number.

It is an amenable number.

133499309 is a deficient number, since it is larger than the sum of its proper divisors (1992595).

133499309 is an equidigital number, since it uses as much as digits as its factorization.

133499309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1992594.

The product of its (nonzero) digits is 78732, while the sum is 41.

The square root of 133499309 is about 11554.1901057582. The cubic root of 133499309 is about 511.0848482287.

The spelling of 133499309 in words is "one hundred thirty-three million, four hundred ninety-nine thousand, three hundred nine".