551161 has 4 divisors (see below), whose sum is σ = 593572. Its totient is φ = 508752.

The previous prime is 551143. The next prime is 551179. The reversal of 551161 is 161155.

551161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (551143) and next prime (551179).

It can be written as a sum of positive squares in 2 ways, for example, as 197136 + 354025 = 444^2 + 595^2 .

It is a cyclic number.

It is not a de Polignac number, because 551161 - 2⁵ = 551129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551461) 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, 21186 + ... + 21211.

It is an arithmetic number, because the mean of its divisors is an integer number (148393).

2⁵⁵¹¹⁶¹ is an apocalyptic number.

It is an amenable number.

551161 is a deficient number, since it is larger than the sum of its proper divisors (42411).

551161 is a wasteful number, since it uses less digits than its factorization.

551161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42410.

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

The square root of 551161 is about 742.4021821089. The cubic root of 551161 is about 81.9897369666.

The spelling of 551161 in words is "five hundred fifty-one thousand, one hundred sixty-one".