551223220 has 12 divisors (see below), whose sum is σ = 1157568804. Its totient is φ = 220489280.

The previous prime is 551223217. The next prime is 551223227. The reversal of 551223220 is 22322155.

It can be written as a sum of positive squares in 2 ways, for example, as 148498596 + 402724624 = 12186^2 + 20068^2 .

It is a junction number, because it is equal to n+sod(n) for n = 551223191 and 551223200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551223227) 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, 13780561 + ... + 13780600.

It is an arithmetic number, because the mean of its divisors is an integer number (96464067).

Almost surely, 2^551223220 is an apocalyptic number.

It is an amenable number.

551223220 is an abundant number, since it is smaller than the sum of its proper divisors (606345584).

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

551223220 is a wasteful number, since it uses less digits than its factorization.

551223220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27561170 (or 27561168 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 551223220 is about 23478.1434530075. The cubic root of 551223220 is about 819.9282209627.

Adding to 551223220 its reverse (22322155), we get a palindrome (573545375).

The spelling of 551223220 in words is "five hundred fifty-one million, two hundred twenty-three thousand, two hundred twenty".