261006719 has 2 divisors, whose sum is σ = 261006720. Its totient is φ = 261006718.

The previous prime is 261006709. The next prime is 261006773. The reversal of 261006719 is 917600162.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261006719 - 2⁴ = 261006703 is a prime.

It is a super-2 number, since 2×261006719² = 136249014726289922, which contains 22 as substring.

It is a Sophie Germain 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 (261006709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130503359 + 130503360.

It is an arithmetic number, because the mean of its divisors is an integer number (130503360).

Almost surely, 2^261006719 is an apocalyptic number.

261006719 is a deficient number, since it is larger than the sum of its proper divisors (1).

261006719 is an equidigital number, since it uses as much as digits as its factorization.

261006719 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 32.

The square root of 261006719 is about 16155.7023678947. The cubic root of 261006719 is about 639.0731366952.

The spelling of 261006719 in words is "two hundred sixty-one million, six thousand, seven hundred nineteen".