2521616 has 20 divisors (see below), whose sum is σ = 4910400. Its totient is φ = 1254432.

The previous prime is 2521613. The next prime is 2521621. The reversal of 2521616 is 6161252.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 2521591 and 2521600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2521613) 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, 5525 + ... + 5963.

It is an arithmetic number, because the mean of its divisors is an integer number (245520).

2^2521616 is an apocalyptic number.

It is an amenable number.

2521616 is a deficient number, since it is larger than the sum of its proper divisors (2388784).

2521616 is a wasteful number, since it uses less digits than its factorization.

2521616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806 (or 800 counting only the distinct ones).

The product of its digits is 720, while the sum is 23.

The square root of 2521616 is about 1587.9596972216. The cubic root of 2521616 is about 136.1109244973.

Adding to 2521616 its reverse (6161252), we get a palindrome (8682868).

The spelling of 2521616 in words is "two million, five hundred twenty-one thousand, six hundred sixteen".