551871 has 12 divisors (see below), whose sum is σ = 844272. Its totient is φ = 346176.

The previous prime is 551861. The next prime is 551909. The reversal of 551871 is 178155.

It is not a de Polignac number, because 551871 - 2⁷ = 551743 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1651 + ... + 1956.

It is an arithmetic number, because the mean of its divisors is an integer number (70356).

2⁵⁵¹⁸⁷¹ is an apocalyptic number.

551871 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

551871 is a deficient number, since it is larger than the sum of its proper divisors (292401).

551871 is a wasteful number, since it uses less digits than its factorization.

551871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3630 (or 3627 counting only the distinct ones).

The product of its digits is 1400, while the sum is 27.

The square root of 551871 is about 742.8802056860. The cubic root of 551871 is about 82.0249279754.

The spelling of 551871 in words is "five hundred fifty-one thousand, eight hundred seventy-one".