551056 has 40 divisors (see below), whose sum is σ = 1214208. Its totient is φ = 240000.

The previous prime is 551039. The next prime is 551059. The reversal of 551056 is 650155.

551056 = T₅₉ + T₆₀ + ... + T₁₅₁.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (551059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5406 + ... + 5506.

2⁵⁵¹⁰⁵⁶ 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 551056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (607104).

551056 is an abundant number, since it is smaller than the sum of its proper divisors (663152).

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

551056 is a wasteful number, since it uses less digits than its factorization.

With its successor (551057) it forms an eRAP, since the sums of their prime factors are consecutive (151 and 152).

551056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151 (or 145 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 551056 is about 742.3314623536. The cubic root of 551056 is about 81.9845300977.

Subtracting 551056 from its reverse (650155), we obtain a palindrome (99099).

It can be divided in two parts, 55 and 1056, that added together give a palindrome (1111).

The spelling of 551056 in words is "five hundred fifty-one thousand, fifty-six".