551005 has 24 divisors (see below), whose sum is σ = 833112. Its totient is φ = 346752.

The previous prime is 551003. The next prime is 551017. The reversal of 551005 is 500155.

551005 is nontrivially palindromic in base 15.

It can be written as a sum of positive squares in 4 ways, for example, as 70756 + 480249 = 266^2 + 693^2 .

It is not a de Polignac number, because 551005 - 2¹ = 551003 is a prime.

551005 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 551005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3099 + ... + 3271.

It is an arithmetic number, because the mean of its divisors is an integer number (34713).

2⁵⁵¹⁰⁰⁵ is an apocalyptic number.

It is an amenable number.

551005 is a deficient number, since it is larger than the sum of its proper divisors (282107).

551005 is a wasteful number, since it uses less digits than its factorization.

551005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205 (or 198 counting only the distinct ones).

The product of its (nonzero) digits is 125, while the sum is 16.

The square root of 551005 is about 742.2971103271. The cubic root of 551005 is about 81.9820008085.

It can be divided in two parts, 5 and 51005, that multiplied together give a square (255025 = 505²).

The spelling of 551005 in words is "five hundred fifty-one thousand, five".