2509643 has 4 divisors (see below), whose sum is σ = 2520648. Its totient is φ = 2498640.

The previous prime is 2509627. The next prime is 2509649. The reversal of 2509643 is 3469052.

2509643 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 is a cyclic number.

It is not a de Polignac number, because 2509643 - 2⁴ = 2509627 is a prime.

It is a d-powerful number, because it can be written as 2 + 5⁹ + 0 + 9⁶ + 6⁴ + 4⁶ + 3⁹ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2509649) 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, 5153 + ... + 5618.

It is an arithmetic number, because the mean of its divisors is an integer number (630162).

2^2509643 is an apocalyptic number.

2509643 is a deficient number, since it is larger than the sum of its proper divisors (11005).

2509643 is a wasteful number, since it uses less digits than its factorization.

2509643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11004.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 2509643 is about 1584.1852795680. The cubic root of 2509643 is about 135.8951578082.

The spelling of 2509643 in words is "two million, five hundred nine thousand, six hundred forty-three".