551686 has 8 divisors (see below), whose sum is σ = 845280. Its totient is φ = 269928.

The previous prime is 551671. The next prime is 551689. The reversal of 551686 is 686155.

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 (551689) by changing a digit.

551686 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, 2841 + ... + 3028.

It is an arithmetic number, because the mean of its divisors is an integer number (105660).

2⁵⁵¹⁶⁸⁶ is an apocalyptic number.

551686 is a deficient number, since it is larger than the sum of its proper divisors (293594).

551686 is a wasteful number, since it uses less digits than its factorization.

551686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5918.

The product of its digits is 7200, while the sum is 31.

The square root of 551686 is about 742.7556798840. The cubic root of 551686 is about 82.0157613962.

The spelling of 551686 in words is "five hundred fifty-one thousand, six hundred eighty-six".