851647489 has 27 divisors (see below), whose sum is σ = 1091823201. Its totient is φ = 661870440.

The previous prime is 851647483. The next prime is 851647493. The reversal of 851647489 is 984746158.

The square root of 851647489 is 29183.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 851647489 - 2⁷ = 851647361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (851647483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2246902 + ... + 2247280.

Almost surely, 2^851647489 is an apocalyptic number.

851647489 is the 29183-rd square number.

851647489 is the 14592-nd centered octagonal number.

It is an amenable number.

851647489 is a deficient number, since it is larger than the sum of its proper divisors (240175712).

851647489 is an equidigital number, since it uses as much as digits as its factorization.

851647489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794 (or 397 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 52.

The cubic root of 851647489 is about 947.8798477007.

The spelling of 851647489 in words is "eight hundred fifty-one million, six hundred forty-seven thousand, four hundred eighty-nine".