261089 has 2 divisors, whose sum is σ = 261090. Its totient is φ = 261088.

The previous prime is 261077. The next prime is 261101. The reversal of 261089 is 980162.

It is a balanced prime because it is at equal distance from previous prime (261077) and next prime (261101).

It can be written as a sum of positive squares in only one way, i.e., 258064 + 3025 = 508^2 + 55^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261089 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261059) 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, 130544 + 130545.

It is an arithmetic number, because the mean of its divisors is an integer number (130545).

2²⁶¹⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

261089 is a deficient number, since it is larger than the sum of its proper divisors (1).

261089 is an equidigital number, since it uses as much as digits as its factorization.

261089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 261089 is about 510.9686878861. The cubic root of 261089 is about 63.9140284459.

The spelling of 261089 in words is "two hundred sixty-one thousand, eighty-nine".