551805 has 8 divisors (see below), whose sum is σ = 882912. Its totient is φ = 294288.

The previous prime is 551801. The next prime is 551809. The reversal of 551805 is 508155.

It is an interprime number because it is at equal distance from previous prime (551801) and next prime (551809).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 551805 - 2² = 551801 is a prime.

It is a Curzon number.

It is a zygodrome in base 7.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 551805.

It is not an unprimeable number, because it can be changed into a prime (551801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18379 + ... + 18408.

It is an arithmetic number, because the mean of its divisors is an integer number (110364).

2⁵⁵¹⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

551805 is a deficient number, since it is larger than the sum of its proper divisors (331107).

551805 is a wasteful number, since it uses less digits than its factorization.

551805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36795.

The product of its (nonzero) digits is 1000, while the sum is 24.

The square root of 551805 is about 742.8357826599. The cubic root of 551805 is about 82.0216579714.

The spelling of 551805 in words is "five hundred fifty-one thousand, eight hundred five".