551012220 has 216 divisors, whose sum is σ = 1907239152. Its totient is φ = 133436160.

The previous prime is 551012213. The next prime is 551012237. The reversal of 551012220 is 22210155.

It is a super-2 number, since 2×551012220² = 607228933178656800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 551012193 and 551012202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 587592 + ... + 588528.

Almost surely, 2^551012220 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 551012220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (953619576).

551012220 is an abundant number, since it is smaller than the sum of its proper divisors (1356226932).

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

551012220 is a wasteful number, since it uses less digits than its factorization.

551012220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 983 (or 958 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 551012220 is about 23473.6494819191. The cubic root of 551012220 is about 819.8235888599.

Adding to 551012220 its reverse (22210155), we get a palindrome (573222375).

The spelling of 551012220 in words is "five hundred fifty-one million, twelve thousand, two hundred twenty".