851005489 has 2 divisors, whose sum is σ = 851005490. Its totient is φ = 851005488.

The previous prime is 851005433. The next prime is 851005531. The reversal of 851005489 is 984500158.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 850713889 + 291600 = 29167^2 + 540^2 .

It is a cyclic number.

It is not a de Polignac number, because 851005489 - 2²¹ = 848908337 is a prime.

It is not a weakly prime, because it can be changed into another prime (851008489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425502744 + 425502745.

It is an arithmetic number, because the mean of its divisors is an integer number (425502745).

Almost surely, 2^851005489 is an apocalyptic number.

It is an amenable number.

851005489 is a deficient number, since it is larger than the sum of its proper divisors (1).

851005489 is an equidigital number, since it uses as much as digits as its factorization.

851005489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 57600, while the sum is 40.

The square root of 851005489 is about 29171.9983717263. The cubic root of 851005489 is about 947.6416067828.

The spelling of 851005489 in words is "eight hundred fifty-one million, five thousand, four hundred eighty-nine".