851981825 has 12 divisors (see below), whose sum is σ = 1062365040. Its totient is φ = 677774160.

The previous prime is 851981791. The next prime is 851981827. The reversal of 851981825 is 528189158.

It is a happy number.

It is not a de Polignac number, because 851981825 - 2⁸ = 851981569 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 851981825.

It is not an unprimeable number, because it can be changed into a prime (851981827) 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 11 ways as a sum of consecutive naturals, for example, 90719 + ... + 99668.

It is an arithmetic number, because the mean of its divisors is an integer number (88530420).

Almost surely, 2^851981825 is an apocalyptic number.

It is an amenable number.

851981825 is a deficient number, since it is larger than the sum of its proper divisors (210383215).

851981825 is a wasteful number, since it uses less digits than its factorization.

851981825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190576 (or 190571 counting only the distinct ones).

The product of its digits is 230400, while the sum is 47.

The square root of 851981825 is about 29188.7277043725. The cubic root of 851981825 is about 948.0038696306.

The spelling of 851981825 in words is "eight hundred fifty-one million, nine hundred eighty-one thousand, eight hundred twenty-five".