261055271 has 2 divisors, whose sum is σ = 261055272. Its totient is φ = 261055270.

The previous prime is 261055261. The next prime is 261055321. The reversal of 261055271 is 172550162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261055271 - 2¹⁴ = 261038887 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261055261) 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, 130527635 + 130527636.

It is an arithmetic number, because the mean of its divisors is an integer number (130527636).

Almost surely, 2^261055271 is an apocalyptic number.

261055271 is a deficient number, since it is larger than the sum of its proper divisors (1).

261055271 is an equidigital number, since it uses as much as digits as its factorization.

261055271 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 261055271 is about 16157.2049253576. The cubic root of 261055271 is about 639.1127606499.

The spelling of 261055271 in words is "two hundred sixty-one million, fifty-five thousand, two hundred seventy-one".