551687 has 4 divisors (see below), whose sum is σ = 553176. Its totient is φ = 550200.

The previous prime is 551671. The next prime is 551689. The reversal of 551687 is 786155.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 786155 = 5 ⋅157231.

It is a cyclic number.

It is not a de Polignac number, because 551687 - 2⁴ = 551671 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 (551689) 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, 308 + ... + 1094.

It is an arithmetic number, because the mean of its divisors is an integer number (138294).

2⁵⁵¹⁶⁸⁷ is an apocalyptic number.

551687 is a deficient number, since it is larger than the sum of its proper divisors (1489).

551687 is an equidigital number, since it uses as much as digits as its factorization.

551687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1488.

The product of its digits is 8400, while the sum is 32.

The square root of 551687 is about 742.7563530526. The cubic root of 551687 is about 82.0158109508.

The spelling of 551687 in words is "five hundred fifty-one thousand, six hundred eighty-seven".