261495359 has 2 divisors, whose sum is σ = 261495360. Its totient is φ = 261495358.

The previous prime is 261495319. The next prime is 261495361. The reversal of 261495359 is 953594162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261495359 - 2¹⁶ = 261429823 is a prime.

Together with 261495361, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261495319) 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, 130747679 + 130747680.

It is an arithmetic number, because the mean of its divisors is an integer number (130747680).

Almost surely, 2^261495359 is an apocalyptic number.

261495359 is a deficient number, since it is larger than the sum of its proper divisors (1).

261495359 is an equidigital number, since it uses as much as digits as its factorization.

261495359 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 291600, while the sum is 44.

The square root of 261495359 is about 16170.8181301998. The cubic root of 261495359 is about 639.4716986254.

The spelling of 261495359 in words is "two hundred sixty-one million, four hundred ninety-five thousand, three hundred fifty-nine".