851247128 has 16 divisors (see below), whose sum is σ = 1596966000. Its totient is φ = 425389536.

The previous prime is 851247113. The next prime is 851247157. The reversal of 851247128 is 821742158.

It is a junction number, because it is equal to n+sod(n) for n = 851247091 and 851247100.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 13283 + ... + 43346.

It is an arithmetic number, because the mean of its divisors is an integer number (99810375).

Almost surely, 2^851247128 is an apocalyptic number.

It is an amenable number.

851247128 is a deficient number, since it is larger than the sum of its proper divisors (745718872).

851247128 is a wasteful number, since it uses less digits than its factorization.

851247128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58514 (or 58510 counting only the distinct ones).

The product of its digits is 35840, while the sum is 38.

The square root of 851247128 is about 29176.1397035317. The cubic root of 851247128 is about 947.7312910850.

The spelling of 851247128 in words is "eight hundred fifty-one million, two hundred forty-seven thousand, one hundred twenty-eight".