551365 has 4 divisors (see below), whose sum is σ = 661644. Its totient is φ = 441088.

The previous prime is 551363. The next prime is 551381. The reversal of 551365 is 563155.

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 431649 + 119716 = 657^2 + 346^2 .

It is a cyclic number.

It is not a de Polignac number, because 551365 - 2¹ = 551363 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55132 + ... + 55141.

It is an arithmetic number, because the mean of its divisors is an integer number (165411).

2⁵⁵¹³⁶⁵ is an apocalyptic number.

It is an amenable number.

551365 is a deficient number, since it is larger than the sum of its proper divisors (110279).

551365 is a wasteful number, since it uses less digits than its factorization.

551365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110278.

The product of its digits is 2250, while the sum is 25.

The square root of 551365 is about 742.5395612356. The cubic root of 551365 is about 81.9998512787. Note that the first 3 decimals are identical.

The spelling of 551365 in words is "five hundred fifty-one thousand, three hundred sixty-five".