261169 has 2 divisors, whose sum is σ = 261170. Its totient is φ = 261168.

The previous prime is 261167. The next prime is 261223. The reversal of 261169 is 961162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 216225 + 44944 = 465^2 + 212^2 .

It is a cyclic number.

It is not a de Polignac number, because 261169 - 2¹ = 261167 is a prime.

It is a super-2 number, since 2×261169² = 136418493122, which contains 22 as substring.

Together with 261167, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (261167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130584 + 130585.

It is an arithmetic number, because the mean of its divisors is an integer number (130585).

2²⁶¹¹⁶⁹ is an apocalyptic number.

It is an amenable number.

261169 is a deficient number, since it is larger than the sum of its proper divisors (1).

261169 is an equidigital number, since it uses as much as digits as its factorization.

261169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 25.

The square root of 261169 is about 511.0469645737. The cubic root of 261169 is about 63.9205557222.

The spelling of 261169 in words is "two hundred sixty-one thousand, one hundred sixty-nine".