551120420 has 12 divisors (see below), whose sum is σ = 1157352924. Its totient is φ = 220448160.

The previous prime is 551120413. The next prime is 551120497. The reversal of 551120420 is 24021155.

It can be written as a sum of positive squares in 2 ways, for example, as 411927616 + 139192804 = 20296^2 + 11798^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 27556021 = 551120420 / (5 + 5 + 1 + 1 + 2 + 0 + 4 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 551120392 and 551120401.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 13777991 + ... + 13778030.

It is an arithmetic number, because the mean of its divisors is an integer number (96446077).

Almost surely, 2^551120420 is an apocalyptic number.

It is an amenable number.

551120420 is an abundant number, since it is smaller than the sum of its proper divisors (606232504).

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

551120420 is a wasteful number, since it uses less digits than its factorization.

551120420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27556030 (or 27556028 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 551120420 is about 23475.9540807184. The cubic root of 551120420 is about 819.8772471415.

Adding to 551120420 its reverse (24021155), we get a palindrome (575141575).

The spelling of 551120420 in words is "five hundred fifty-one million, one hundred twenty thousand, four hundred twenty".