261280573 has 2 divisors, whose sum is σ = 261280574. Its totient is φ = 261280572.

The previous prime is 261280561. The next prime is 261280601. The reversal of 261280573 is 375082162.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157301764 + 103978809 = 12542^2 + 10197^2 .

It is a cyclic number.

It is not a de Polignac number, because 261280573 - 2¹³ = 261272381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261280553) 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, 130640286 + 130640287.

It is an arithmetic number, because the mean of its divisors is an integer number (130640287).

Almost surely, 2^261280573 is an apocalyptic number.

It is an amenable number.

261280573 is a deficient number, since it is larger than the sum of its proper divisors (1).

261280573 is an equidigital number, since it uses as much as digits as its factorization.

261280573 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 261280573 is about 16164.1756053317. The cubic root of 261280573 is about 639.2965684419.

The spelling of 261280573 in words is "two hundred sixty-one million, two hundred eighty thousand, five hundred seventy-three".