261304339 has 2 divisors, whose sum is σ = 261304340. Its totient is φ = 261304338.

The previous prime is 261304279. The next prime is 261304411. The reversal of 261304339 is 933403162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261304339 - 2²¹ = 259207187 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261304339.

It is not a weakly prime, because it can be changed into another prime (261304039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130652169 + 130652170.

It is an arithmetic number, because the mean of its divisors is an integer number (130652170).

Almost surely, 2^261304339 is an apocalyptic number.

261304339 is a deficient number, since it is larger than the sum of its proper divisors (1).

261304339 is an equidigital number, since it uses as much as digits as its factorization.

261304339 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 31.

The square root of 261304339 is about 16164.9107328188. The cubic root of 261304339 is about 639.3159512602.

The spelling of 261304339 in words is "two hundred sixty-one million, three hundred four thousand, three hundred thirty-nine".