2190509 has 4 divisors (see below), whose sum is σ = 2195100. Its totient is φ = 2185920.

The previous prime is 2190499. The next prime is 2190521. The reversal of 2190509 is 9050912.

It is a happy number.

2190509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 697225 + 1493284 = 835^2 + 1222^2 .

It is a cyclic number.

It is not a de Polignac number, because 2190509 - 2¹⁶ = 2124973 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2190599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1484 + ... + 2565.

It is an arithmetic number, because the mean of its divisors is an integer number (548775).

2^2190509 is an apocalyptic number.

It is an amenable number.

2190509 is a deficient number, since it is larger than the sum of its proper divisors (4591).

2190509 is an equidigital number, since it uses as much as digits as its factorization.

2190509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4590.

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 2190509 is about 1480.0368238662. The cubic root of 2190509 is about 129.8718460941.

The spelling of 2190509 in words is "two million, one hundred ninety thousand, five hundred nine".