551425821 has 8 divisors (see below), whose sum is σ = 778483584. Its totient is φ = 345992640.

The previous prime is 551425811. The next prime is 551425843. The reversal of 551425821 is 128524155.

551425821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 551425821 - 2⁶ = 551425757 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551425811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5406085 + ... + 5406186.

It is an arithmetic number, because the mean of its divisors is an integer number (97310448).

Almost surely, 2^551425821 is an apocalyptic number.

551425821 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

551425821 is a deficient number, since it is larger than the sum of its proper divisors (227057763).

551425821 is a wasteful number, since it uses less digits than its factorization.

551425821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10812291.

The product of its digits is 16000, while the sum is 33.

The square root of 551425821 is about 23482.4577291220. The cubic root of 551425821 is about 820.0286629878.

Adding to 551425821 its reverse (128524155), we get a palindrome (679949976).

The spelling of 551425821 in words is "five hundred fifty-one million, four hundred twenty-five thousand, eight hundred twenty-one".