261055259 has 2 divisors, whose sum is σ = 261055260. Its totient is φ = 261055258.

The previous prime is 261055237. The next prime is 261055261. The reversal of 261055259 is 952550162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261055259 - 2²⁴ = 244278043 is a prime.

Together with 261055261, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261055219) 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, 130527629 + 130527630.

It is an arithmetic number, because the mean of its divisors is an integer number (130527630).

Almost surely, 2^261055259 is an apocalyptic number.

261055259 is a deficient number, since it is larger than the sum of its proper divisors (1).

261055259 is an equidigital number, since it uses as much as digits as its factorization.

261055259 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 261055259 is about 16157.2045540062. The cubic root of 261055259 is about 639.1127508571.

The spelling of 261055259 in words is "two hundred sixty-one million, fifty-five thousand, two hundred fifty-nine".