551143321 has 4 divisors (see below), whose sum is σ = 553449600. Its totient is φ = 548837044.

The previous prime is 551143303. The next prime is 551143337. The reversal of 551143321 is 123341155.

It is a happy number.

551143321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 551143321 - 2¹⁹ = 550619033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551143301) 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, 1152781 + ... + 1153258.

It is an arithmetic number, because the mean of its divisors is an integer number (138362400).

Almost surely, 2^551143321 is an apocalyptic number.

It is an amenable number.

551143321 is a deficient number, since it is larger than the sum of its proper divisors (2306279).

551143321 is a wasteful number, since it uses less digits than its factorization.

551143321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2306278.

The product of its digits is 1800, while the sum is 25.

The square root of 551143321 is about 23476.4418300559. The cubic root of 551143321 is about 819.8886032494. Note that the first 3 decimals are identical.

Adding to 551143321 its reverse (123341155), we get a palindrome (674484476).

The spelling of 551143321 in words is "five hundred fifty-one million, one hundred forty-three thousand, three hundred twenty-one".