551863 has 4 divisors (see below), whose sum is σ = 594328. Its totient is φ = 509400.

The previous prime is 551861. The next prime is 551909. The reversal of 551863 is 368155.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 551863 - 2¹ = 551861 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 (551861) 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, 21213 + ... + 21238.

It is an arithmetic number, because the mean of its divisors is an integer number (148582).

2⁵⁵¹⁸⁶³ is an apocalyptic number.

551863 is a deficient number, since it is larger than the sum of its proper divisors (42465).

551863 is a wasteful number, since it uses less digits than its factorization.

551863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42464.

The product of its digits is 3600, while the sum is 28.

The square root of 551863 is about 742.8748212182. The cubic root of 551863 is about 82.0245316251.

The spelling of 551863 in words is "five hundred fifty-one thousand, eight hundred sixty-three".