851005549 has 2 divisors, whose sum is σ = 851005550. Its totient is φ = 851005548.

The previous prime is 851005531. The next prime is 851005607. The reversal of 851005549 is 945500158.

851005549 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., 619661449 + 231344100 = 24893^2 + 15210^2 .

It is a cyclic number.

It is not a de Polignac number, because 851005549 - 2¹¹ = 851003501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (851005049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425502774 + 425502775.

It is an arithmetic number, because the mean of its divisors is an integer number (425502775).

Almost surely, 2^851005549 is an apocalyptic number.

It is an amenable number.

851005549 is a deficient number, since it is larger than the sum of its proper divisors (1).

851005549 is an equidigital number, since it uses as much as digits as its factorization.

851005549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36000, while the sum is 37.

The square root of 851005549 is about 29171.9994001097. Note that the first 3 decimals coincide. The cubic root of 851005549 is about 947.6416290539.

The spelling of 851005549 in words is "eight hundred fifty-one million, five thousand, five hundred forty-nine".