800551 has 4 divisors (see below), whose sum is σ = 817632. Its totient is φ = 783472.

The previous prime is 800549. The next prime is 800557. The reversal of 800551 is 155008.

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 800551 - 2¹ = 800549 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 (800557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8470 + ... + 8563.

It is an arithmetic number, because the mean of its divisors is an integer number (204408).

2⁸⁰⁰⁵⁵¹ is an apocalyptic number.

800551 is a deficient number, since it is larger than the sum of its proper divisors (17081).

800551 is a wasteful number, since it uses less digits than its factorization.

800551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17080.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 800551 is about 894.7351563452. The cubic root of 800551 is about 92.8530844098.

Adding to 800551 its reverse (155008), we get a palindrome (955559).

The spelling of 800551 in words is "eight hundred thousand, five hundred fifty-one".