2133509 has 6 divisors (see below), whose sum is σ = 2481894. Its totient is φ = 1828680.

The previous prime is 2133487. The next prime is 2133533. The reversal of 2133509 is 9053312.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1416100 + 717409 = 1190^2 + 847^2 .

It is not a de Polignac number, because 2133509 - 2⁸ = 2133253 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 (2133539) 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 5 ways as a sum of consecutive naturals, for example, 21722 + ... + 21819.

It is an arithmetic number, because the mean of its divisors is an integer number (413649).

2^2133509 is an apocalyptic number.

It is an amenable number.

2133509 is a deficient number, since it is larger than the sum of its proper divisors (348385).

2133509 is an equidigital number, since it uses as much as digits as its factorization.

2133509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43555 (or 43548 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 23.

The square root of 2133509 is about 1460.6536208150. The cubic root of 2133509 is about 128.7354512734.

The spelling of 2133509 in words is "two million, one hundred thirty-three thousand, five hundred nine".