551816 has 16 divisors (see below), whose sum is σ = 1080000. Its totient is φ = 263824.

The previous prime is 551813. The next prime is 551843. The reversal of 551816 is 618155.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 551816.

It is not an unprimeable number, because it can be changed into a prime (551813) 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, 1316 + ... + 1683.

It is an arithmetic number, because the mean of its divisors is an integer number (67500).

2⁵⁵¹⁸¹⁶ is an apocalyptic number.

It is an amenable number.

551816 is a deficient number, since it is larger than the sum of its proper divisors (528184).

551816 is a wasteful number, since it uses less digits than its factorization.

551816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3028 (or 3024 counting only the distinct ones).

The product of its digits is 1200, while the sum is 26.

The square root of 551816 is about 742.8431866821. The cubic root of 551816 is about 82.0222029902.

It can be divided in two parts, 5518 and 16, that multiplied together give a palindrome (88288).

The spelling of 551816 in words is "five hundred fifty-one thousand, eight hundred sixteen".