551806 has 8 divisors (see below), whose sum is σ = 841464.
Its totient is φ = 271320.
The previous prime is 551801. The next prime is 551809. The reversal of 551806 is 608155.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (551801) by changing a digit.
551806 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2140 + ... + 2383.
It is an arithmetic number, because the mean of its divisors is an integer number (105183).
2551806 is an apocalyptic number.
551806 is a deficient number, since it is larger than the sum of its proper divisors (289658).
551806 is a wasteful number, since it uses less digits than its factorization.
551806 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 4586.
The product of its (nonzero) digits is 1200, while the sum is 25.
The square root of 551806 is about 742.8364557559.
The cubic root of 551806 is about 82.0217075189.
The spelling of 551806 in words is "five hundred fifty-one thousand, eight hundred six".