261006773 has 2 divisors, whose sum is σ = 261006774. Its totient is φ = 261006772.

The previous prime is 261006719. The next prime is 261006791. The reversal of 261006773 is 377600162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 238177489 + 22829284 = 15433^2 + 4778^2 .

It is a cyclic number.

It is not a de Polignac number, because 261006773 - 2⁶ = 261006709 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, 130503386 + 130503387.

It is an arithmetic number, because the mean of its divisors is an integer number (130503387).

Almost surely, 2^261006773 is an apocalyptic number.

It is an amenable number.

261006773 is a deficient number, since it is larger than the sum of its proper divisors (1).

261006773 is an equidigital number, since it uses as much as digits as its factorization.

261006773 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 261006773 is about 16155.7040391312. The cubic root of 261006773 is about 639.0731807681.

The spelling of 261006773 in words is "two hundred sixty-one million, six thousand, seven hundred seventy-three".