551121 has 4 divisors (see below), whose sum is σ = 734832. Its totient is φ = 367412.

The previous prime is 551113. The next prime is 551129. The reversal of 551121 is 121155.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (551113) and next prime (551129).

It is a cyclic number.

It is not a de Polignac number, because 551121 - 2³ = 551113 is a prime.

It is a D-number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 551121.

It is not an unprimeable number, because it can be changed into a prime (551129) 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, 91851 + ... + 91856.

It is an arithmetic number, because the mean of its divisors is an integer number (183708).

2⁵⁵¹¹²¹ is an apocalyptic number.

It is an amenable number.

551121 is a deficient number, since it is larger than the sum of its proper divisors (183711).

551121 is a wasteful number, since it uses less digits than its factorization.

551121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183710.

The product of its digits is 50, while the sum is 15.

The square root of 551121 is about 742.3752420441. The cubic root of 551121 is about 81.9877534755.

Adding to 551121 its reverse (121155), we get a palindrome (672276).

It can be divided in two parts, 55 and 1121, that added together give a triangular number (1176 = T₄₈).

The spelling of 551121 in words is "five hundred fifty-one thousand, one hundred twenty-one".