261006709 has 2 divisors, whose sum is σ = 261006710. Its totient is φ = 261006708.

The previous prime is 261006703. The next prime is 261006719. The reversal of 261006709 is 907600162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157577809 + 103428900 = 12553^2 + 10170^2 .

It is a cyclic number.

It is not a de Polignac number, because 261006709 - 2⁵ = 261006677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261006703) 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, 130503354 + 130503355.

It is an arithmetic number, because the mean of its divisors is an integer number (130503355).

Almost surely, 2^261006709 is an apocalyptic number.

It is an amenable number.

261006709 is a deficient number, since it is larger than the sum of its proper divisors (1).

261006709 is an equidigital number, since it uses as much as digits as its factorization.

261006709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 261006709 is about 16155.7020584065. The cubic root of 261006709 is about 639.0731285336.

The spelling of 261006709 in words is "two hundred sixty-one million, six thousand, seven hundred nine".