551123 has 6 divisors (see below), whose sum is σ = 585756. Its totient is φ = 518432.

The previous prime is 551113. The next prime is 551129. The reversal of 551123 is 321155.

It is not a de Polignac number, because 551123 - 2⁴ = 551107 is a prime.

It is a super-2 number, since 2×551123² = 607473122258, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551129) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 665 + ... + 1242.

It is an arithmetic number, because the mean of its divisors is an integer number (97626).

2⁵⁵¹¹²³ is an apocalyptic number.

551123 is a deficient number, since it is larger than the sum of its proper divisors (34633).

551123 is a wasteful number, since it uses less digits than its factorization.

551123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1941 (or 1924 counting only the distinct ones).

The product of its digits is 150, while the sum is 17.

The square root of 551123 is about 742.3765890705. The cubic root of 551123 is about 81.9878526523.

Adding to 551123 its reverse (321155), we get a palindrome (872278).

The spelling of 551123 in words is "five hundred fifty-one thousand, one hundred twenty-three".