261061 has 2 divisors, whose sum is σ = 261062. Its totient is φ = 261060.

The previous prime is 261059. The next prime is 261071. The reversal of 261061 is 160162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 260100 + 961 = 510^2 + 31^2 .

It is a cyclic number.

It is not a de Polignac number, because 261061 - 2¹ = 261059 is a prime.

Together with 261059, it forms a pair of twin primes.

261061 is a lucky number.

It is equal to p₂₂₉₂₁ and since 261061 and 22921 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130530 + 130531.

It is an arithmetic number, because the mean of its divisors is an integer number (130531).

2²⁶¹⁰⁶¹ is an apocalyptic number.

261061 is the 229-th centered decagonal number.

It is an amenable number.

261061 is a deficient number, since it is larger than the sum of its proper divisors (1).

261061 is an equidigital number, since it uses as much as digits as its factorization.

261061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 261061 is about 510.9412882123. The cubic root of 261061 is about 63.9117435841.

The spelling of 261061 in words is "two hundred sixty-one thousand, sixty-one".