2509663 has 4 divisors (see below), whose sum is σ = 2702728. Its totient is φ = 2316600.

The previous prime is 2509649. The next prime is 2509679. The reversal of 2509663 is 3669052.

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

It is a de Polignac number, because none of the positive numbers 2^k-2509663 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 (2509613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96513 + ... + 96538.

It is an arithmetic number, because the mean of its divisors is an integer number (675682).

2^2509663 is an apocalyptic number.

2509663 is a deficient number, since it is larger than the sum of its proper divisors (193065).

2509663 is a wasteful number, since it uses less digits than its factorization.

2509663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193064.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 2509663 is about 1584.1915919484. The cubic root of 2509663 is about 135.8955188019.

The spelling of 2509663 in words is "two million, five hundred nine thousand, six hundred sixty-three".