551081 has 4 divisors (see below), whose sum is σ = 564564. Its totient is φ = 537600.

The previous prime is 551069. The next prime is 551093. The reversal of 551081 is 180155.

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 (551069) and next prime (551093).

It can be written as a sum of positive squares in 2 ways, for example, as 48400 + 502681 = 220^2 + 709^2 .

It is a cyclic number.

It is not a de Polignac number, because 551081 - 2⁶ = 551017 is a prime.

It is a super-2 number, since 2×551081² = 607380537122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (551281) 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, 6680 + ... + 6761.

It is an arithmetic number, because the mean of its divisors is an integer number (141141).

2⁵⁵¹⁰⁸¹ is an apocalyptic number.

It is an amenable number.

551081 is a deficient number, since it is larger than the sum of its proper divisors (13483).

551081 is a wasteful number, since it uses less digits than its factorization.

551081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13482.

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 551081 is about 742.3483010016. The cubic root of 551081 is about 81.9857698884.

The spelling of 551081 in words is "five hundred fifty-one thousand, eighty-one".