261412709 has 2 divisors, whose sum is σ = 261412710. Its totient is φ = 261412708.

The previous prime is 261412691. The next prime is 261412741. The reversal of 261412709 is 907214162.

It is a happy number.

It is an a-pointer prime, because the next prime (261412741) can be obtained adding 261412709 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205492225 + 55920484 = 14335^2 + 7478^2 .

It is a cyclic number.

It is not a de Polignac number, because 261412709 - 2⁸ = 261412453 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261412309) 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, 130706354 + 130706355.

It is an arithmetic number, because the mean of its divisors is an integer number (130706355).

Almost surely, 2^261412709 is an apocalyptic number.

It is an amenable number.

261412709 is a deficient number, since it is larger than the sum of its proper divisors (1).

261412709 is an equidigital number, since it uses as much as digits as its factorization.

261412709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 261412709 is about 16168.2623989098. The cubic root of 261412709 is about 639.4043196028.

The spelling of 261412709 in words is "two hundred sixty-one million, four hundred twelve thousand, seven hundred nine".