551261 has 4 divisors (see below), whose sum is σ = 570300. Its totient is φ = 532224.

The previous prime is 551233. The next prime is 551269. The reversal of 551261 is 162155.

551261 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 can be written as a sum of positive squares in 2 ways, for example, as 383161 + 168100 = 619^2 + 410^2 .

It is a cyclic number.

It is not a de Polignac number, because 551261 - 2⁶ = 551197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 551261.

It is not an unprimeable number, because it can be changed into a prime (551269) 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, 9476 + ... + 9533.

It is an arithmetic number, because the mean of its divisors is an integer number (142575).

2⁵⁵¹²⁶¹ is an apocalyptic number.

It is an amenable number.

551261 is a deficient number, since it is larger than the sum of its proper divisors (19039).

551261 is a wasteful number, since it uses less digits than its factorization.

551261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19038.

The product of its digits is 300, while the sum is 20.

The square root of 551261 is about 742.4695279942. The cubic root of 551261 is about 81.9946952745.

The spelling of 551261 in words is "five hundred fifty-one thousand, two hundred sixty-one".