551859 has 16 divisors (see below), whose sum is σ = 917760. Its totient is φ = 286560.

The previous prime is 551849. The next prime is 551861. The reversal of 551859 is 958155.

551859 = 192² + 193² + ... + 205².

It is not a de Polignac number, because 551859 - 2⁴ = 551843 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (551809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 964 + ... + 1425.

It is an arithmetic number, because the mean of its divisors is an integer number (57360).

2⁵⁵¹⁸⁵⁹ is an apocalyptic number.

551859 is a deficient number, since it is larger than the sum of its proper divisors (365901).

551859 is a wasteful number, since it uses less digits than its factorization.

551859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2410.

The product of its digits is 9000, while the sum is 33.

The square root of 551859 is about 742.8721289697. The cubic root of 551859 is about 82.0243334486.

The spelling of 551859 in words is "five hundred fifty-one thousand, eight hundred fifty-nine".