551331 has 12 divisors (see below), whose sum is σ = 868920. Its totient is φ = 334080.

The previous prime is 551321. The next prime is 551339. The reversal of 551331 is 133155.

It is a happy number.

It is not a de Polignac number, because 551331 - 2¹³ = 543139 is a prime.

It is a super-2 number, since 2×551331² = 607931743122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551339) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2686 + ... + 2883.

It is an arithmetic number, because the mean of its divisors is an integer number (72410).

2⁵⁵¹³³¹ is an apocalyptic number.

551331 is a deficient number, since it is larger than the sum of its proper divisors (317589).

551331 is a wasteful number, since it uses less digits than its factorization.

551331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5586 (or 5583 counting only the distinct ones).

The product of its digits is 225, while the sum is 18.

The square root of 551331 is about 742.5166664796. The cubic root of 551331 is about 81.9981657333.

Adding to 551331 its reverse (133155), we get a palindrome (684486).

The spelling of 551331 in words is "five hundred fifty-one thousand, three hundred thirty-one".