551222100 has 216 divisors, whose sum is σ = 2030307552. Its totient is φ = 123321600.

The previous prime is 551222033. The next prime is 551222171. The reversal of 551222100 is 1222155.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 126559 + ... + 130841.

It is an arithmetic number, because the mean of its divisors is an integer number (9399572).

Almost surely, 2^551222100 is an apocalyptic number.

551222100 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 551222100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1015153776).

551222100 is an abundant number, since it is smaller than the sum of its proper divisors (1479085452).

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

551222100 is a wasteful number, since it uses less digits than its factorization.

551222100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4327 (or 4317 counting only the distinct ones).

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

The square root of 551222100 is about 23478.1196010243. The cubic root of 551222100 is about 819.9276656400.

Adding to 551222100 its reverse (1222155), we get a palindrome (552444255).

Subtracting from 551222100 its reverse (1222155), we obtain a palindrome (549999945).

The spelling of 551222100 in words is "five hundred fifty-one million, two hundred twenty-two thousand, one hundred".