551611 has 4 divisors (see below), whose sum is σ = 559912. Its totient is φ = 543312.

The previous prime is 551597. The next prime is 551651. The reversal of 551611 is 116155.

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 551611 - 2⁷ = 551483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551651) 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, 4050 + ... + 4183.

It is an arithmetic number, because the mean of its divisors is an integer number (139978).

2⁵⁵¹⁶¹¹ is an apocalyptic number.

551611 is a deficient number, since it is larger than the sum of its proper divisors (8301).

551611 is an equidigital number, since it uses as much as digits as its factorization.

551611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8300.

The product of its digits is 150, while the sum is 19.

The square root of 551611 is about 742.7051905029. The cubic root of 551611 is about 82.0120446317.

Adding to 551611 its reverse (116155), we get a palindrome (667766).

The spelling of 551611 in words is "five hundred fifty-one thousand, six hundred eleven".