551807 has 4 divisors (see below), whose sum is σ = 559440. Its totient is φ = 544176.

The previous prime is 551801. The next prime is 551809. The reversal of 551807 is 708155.

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 551807 - 2⁶ = 551743 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 (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 3 ways as a sum of consecutive naturals, for example, 3707 + ... + 3852.

It is an arithmetic number, because the mean of its divisors is an integer number (139860).

2⁵⁵¹⁸⁰⁷ is an apocalyptic number.

551807 is a deficient number, since it is larger than the sum of its proper divisors (7633).

551807 is an equidigital number, since it uses as much as digits as its factorization.

551807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7632.

The product of its (nonzero) digits is 1400, while the sum is 26.

The square root of 551807 is about 742.8371288513. The cubic root of 551807 is about 82.0217570663.

The spelling of 551807 in words is "five hundred fifty-one thousand, eight hundred seven".