261344089 has 2 divisors, whose sum is σ = 261344090. Its totient is φ = 261344088.

The previous prime is 261344081. The next prime is 261344119. The reversal of 261344089 is 980443162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 261307225 + 36864 = 16165^2 + 192^2 .

It is a cyclic number.

It is not a de Polignac number, because 261344089 - 2³ = 261344081 is a prime.

It is not a weakly prime, because it can be changed into another prime (261344081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130672044 + 130672045.

It is an arithmetic number, because the mean of its divisors is an integer number (130672045).

Almost surely, 2^261344089 is an apocalyptic number.

It is an amenable number.

261344089 is a deficient number, since it is larger than the sum of its proper divisors (1).

261344089 is an equidigital number, since it uses as much as digits as its factorization.

261344089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 261344089 is about 16166.1402010498. The cubic root of 261344089 is about 639.3483675105.

The spelling of 261344089 in words is "two hundred sixty-one million, three hundred forty-four thousand, eighty-nine".