551305 has 4 divisors (see below), whose sum is σ = 661572. Its totient is φ = 441040.

The previous prime is 551297. The next prime is 551311. The reversal of 551305 is 503155.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 251001 + 300304 = 501^2 + 548^2 .

It is not a de Polignac number, because 551305 - 2³ = 551297 is a prime.

It is a Duffinian number.

551305 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55126 + ... + 55135.

It is an arithmetic number, because the mean of its divisors is an integer number (165393).

2⁵⁵¹³⁰⁵ is an apocalyptic number.

It is an amenable number.

551305 is a deficient number, since it is larger than the sum of its proper divisors (110267).

551305 is a wasteful number, since it uses less digits than its factorization.

551305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110266.

The product of its (nonzero) digits is 375, while the sum is 19.

The square root of 551305 is about 742.4991582487. The cubic root of 551305 is about 81.9968767401.

The spelling of 551305 in words is "five hundred fifty-one thousand, three hundred five".