865606549 has 2 divisors, whose sum is σ = 865606550. Its totient is φ = 865606548.

The previous prime is 865606537. The next prime is 865606603. The reversal of 865606549 is 945606568.

It is a happy number.

865606549 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 806162449 + 59444100 = 28393^2 + 7710^2 .

It is a cyclic number.

It is not a de Polignac number, because 865606549 - 2²⁹ = 328735637 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 (865606349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432803274 + 432803275.

It is an arithmetic number, because the mean of its divisors is an integer number (432803275).

Almost surely, 2^865606549 is an apocalyptic number.

It is an amenable number.

865606549 is a deficient number, since it is larger than the sum of its proper divisors (1).

865606549 is an equidigital number, since it uses as much as digits as its factorization.

865606549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1555200, while the sum is 49.

The square root of 865606549 is about 29421.1921750292. The cubic root of 865606549 is about 953.0305984354.

The spelling of 865606549 in words is "eight hundred sixty-five million, six hundred six thousand, five hundred forty-nine".