2516639 has 4 divisors (see below), whose sum is σ = 2524200. Its totient is φ = 2509080.

The previous prime is 2516603. The next prime is 2516659. The reversal of 2516639 is 9366152.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2516639 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2516659) 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, 3257 + ... + 3954.

It is an arithmetic number, because the mean of its divisors is an integer number (631050).

2^2516639 is an apocalyptic number.

2516639 is a deficient number, since it is larger than the sum of its proper divisors (7561).

2516639 is an equidigital number, since it uses as much as digits as its factorization.

2516639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7560.

The product of its digits is 9720, while the sum is 32.

The square root of 2516639 is about 1586.3918179315. The cubic root of 2516639 is about 136.0213165837.

The spelling of 2516639 in words is "two million, five hundred sixteen thousand, six hundred thirty-nine".