551231320 has 16 divisors (see below), whose sum is σ = 1240270560. Its totient is φ = 220492512.

The previous prime is 551231299. The next prime is 551231321. The reversal of 551231320 is 23132155.

551231320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 551231291 and 551231300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551231321) 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, 6890352 + ... + 6890431.

It is an arithmetic number, because the mean of its divisors is an integer number (77516910).

Almost surely, 2^551231320 is an apocalyptic number.

It is an amenable number.

551231320 is an abundant number, since it is smaller than the sum of its proper divisors (689039240).

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

551231320 is a wasteful number, since it uses less digits than its factorization.

551231320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13780794 (or 13780790 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 551231320 is about 23478.3159532365. The cubic root of 551231320 is about 819.9322371131.

Adding to 551231320 its reverse (23132155), we get a palindrome (574363475).

The spelling of 551231320 in words is "five hundred fifty-one million, two hundred thirty-one thousand, three hundred twenty".