2551616 has 14 divisors (see below), whose sum is σ = 5063490. Its totient is φ = 1275776.

The previous prime is 2551607. The next prime is 2551639. The reversal of 2551616 is 6161552.

2551616 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2238016 + 313600 = 1496^2 + 560^2 .

It is a super-2 number, since 2×2551616² = 13021488422912, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 19871 + ... + 19998.

2^2551616 is an apocalyptic number.

It is an amenable number.

2551616 is a deficient number, since it is larger than the sum of its proper divisors (2511874).

2551616 is an equidigital number, since it uses as much as digits as its factorization.

2551616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39881 (or 39871 counting only the distinct ones).

The product of its digits is 1800, while the sum is 26.

The square root of 2551616 is about 1597.3778513552. The cubic root of 2551616 is about 136.6485745103.

The spelling of 2551616 in words is "two million, five hundred fifty-one thousand, six hundred sixteen".