261305039 has 2 divisors, whose sum is σ = 261305040. Its totient is φ = 261305038.

The previous prime is 261304997. The next prime is 261305069. The reversal of 261305039 is 930503162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261305039 - 2¹² = 261300943 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 (261305069) 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, 130652519 + 130652520.

It is an arithmetic number, because the mean of its divisors is an integer number (130652520).

Almost surely, 2^261305039 is an apocalyptic number.

261305039 is a deficient number, since it is larger than the sum of its proper divisors (1).

261305039 is an equidigital number, since it uses as much as digits as its factorization.

261305039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 261305039 is about 16164.9323846405. The cubic root of 261305039 is about 639.3165221408.

The spelling of 261305039 in words is "two hundred sixty-one million, three hundred five thousand, thirty-nine".