133037809 has 4 divisors (see below), whose sum is σ = 133061616. Its totient is φ = 133014004.

The previous prime is 133037797. The next prime is 133037831. The reversal of 133037809 is 908730331.

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: 908730331 = 59 ⋅15402209.

It is a cyclic number.

It is not a de Polignac number, because 133037809 - 2¹⁷ = 132906737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133037899) 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, 1542 + ... + 16384.

It is an arithmetic number, because the mean of its divisors is an integer number (33265404).

Almost surely, 2^133037809 is an apocalyptic number.

It is an amenable number.

133037809 is a deficient number, since it is larger than the sum of its proper divisors (23807).

133037809 is an equidigital number, since it uses as much as digits as its factorization.

133037809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23806.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 133037809 is about 11534.2017062300. The cubic root of 133037809 is about 510.4952372560.

It can be divided in two parts, 13303 and 7809, that added together give a palindrome (21112).

The spelling of 133037809 in words is "one hundred thirty-three million, thirty-seven thousand, eight hundred nine".