551616 has 84 divisors (see below), whose sum is σ = 1673352. Its totient is φ = 159744.

The previous prime is 551597. The next prime is 551651. The reversal of 551616 is 616155.

It is a super-2 number, since 2×551616² = 608560422912, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 551616.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32440 + ... + 32456.

2⁵⁵¹⁶¹⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 551616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (836676).

551616 is an abundant number, since it is smaller than the sum of its proper divisors (1121736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

551616 is a wasteful number, since it uses less digits than its factorization.

551616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58 (or 35 counting only the distinct ones).

The product of its digits is 900, while the sum is 24.

The square root of 551616 is about 742.7085565685. The cubic root of 551616 is about 82.0122924265.

The spelling of 551616 in words is "five hundred fifty-one thousand, six hundred sixteen".