551205520 has 40 divisors (see below), whose sum is σ = 1285705656. Its totient is φ = 219767808.

The previous prime is 551205503. The next prime is 551205521. The reversal of 551205520 is 25502155.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2521744 + 548683776 = 1588^2 + 23424^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (551205521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14034 + ... + 36046.

Almost surely, 2^551205520 is an apocalyptic number.

It is an amenable number.

551205520 is an abundant number, since it is smaller than the sum of its proper divisors (734500136).

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

551205520 is a wasteful number, since it uses less digits than its factorization.

551205520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22339 (or 22333 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 25.

The square root of 551205520 is about 23477.7665036519. The cubic root of 551205520 is about 819.9194447934.

Adding to 551205520 its reverse (25502155), we get a palindrome (576707675).

The spelling of 551205520 in words is "five hundred fifty-one million, two hundred five thousand, five hundred twenty".