551145 has 32 divisors (see below), whose sum is σ = 1048320. Its totient is φ = 241920.

The previous prime is 551143. The next prime is 551179. The reversal of 551145 is 541155.

It is not a de Polignac number, because 551145 - 2¹ = 551143 is a prime.

It is a super-2 number, since 2×551145² = 607521622050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 551145.

It is not an unprimeable number, because it can be changed into a prime (551143) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2955 + ... + 3135.

It is an arithmetic number, because the mean of its divisors is an integer number (32760).

2⁵⁵¹¹⁴⁵ is an apocalyptic number.

It is an amenable number.

551145 is a deficient number, since it is larger than the sum of its proper divisors (497175).

551145 is a wasteful number, since it uses less digits than its factorization.

551145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225.

The product of its digits is 500, while the sum is 21.

The square root of 551145 is about 742.3914062003. The cubic root of 551145 is about 81.9889435817.

It can be divided in two parts, 551 and 145, that added together give a palindrome (696).

The spelling of 551145 in words is "five hundred fifty-one thousand, one hundred forty-five".