551343221 has 8 divisors (see below), whose sum is σ = 647732064. Its totient is φ = 462665520.

The previous prime is 551343161. The next prime is 551343223. The reversal of 551343221 is 122343155.

It is a happy number.

551343221 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 a cyclic number.

It is not a de Polignac number, because 551343221 - 2¹⁴ = 551326837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551343223) 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, 1927631 + ... + 1927916.

It is an arithmetic number, because the mean of its divisors is an integer number (80966508).

Almost surely, 2^551343221 is an apocalyptic number.

It is an amenable number.

551343221 is a deficient number, since it is larger than the sum of its proper divisors (96388843).

551343221 is a wasteful number, since it uses less digits than its factorization.

551343221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3855571.

The product of its digits is 3600, while the sum is 26.

The square root of 551343221 is about 23480.6989035676. The cubic root of 551343221 is about 819.9877159572.

Adding to 551343221 its reverse (122343155), we get a palindrome (673686376).

The spelling of 551343221 in words is "five hundred fifty-one million, three hundred forty-three thousand, two hundred twenty-one".