2509321 has 4 divisors (see below), whose sum is σ = 2517652. Its totient is φ = 2500992.

The previous prime is 2509313. The next prime is 2509333. The reversal of 2509321 is 1239052.

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 518400 + 1990921 = 720^2 + 1411^2 .

It is a cyclic number.

It is not a de Polignac number, because 2509321 - 2³ = 2509313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2509292 and 2509301.

It is not an unprimeable number, because it can be changed into a prime (2509301) 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, 3696 + ... + 4321.

It is an arithmetic number, because the mean of its divisors is an integer number (629413).

2^2509321 is an apocalyptic number.

It is an amenable number.

2509321 is a deficient number, since it is larger than the sum of its proper divisors (8331).

2509321 is an equidigital number, since it uses as much as digits as its factorization.

2509321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8330.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 2509321 is about 1584.0836467813. The cubic root of 2509321 is about 135.8893455456.

The spelling of 2509321 in words is "two million, five hundred nine thousand, three hundred twenty-one".