851936642 has 6 divisors (see below), whose sum is σ = 1277966883. Its totient is φ = 425947682.

The previous prime is 851936621. The next prime is 851936647. The reversal of 851936642 is 246639158.

It can be written as a sum of positive squares in only one way, i.e., 425968321 + 425968321 = 20639^2 + 20639^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=20639.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 851936593 and 851936602.

It is not an unprimeable number, because it can be changed into a prime (851936647) 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 in 2 ways as a sum of consecutive naturals, for example, 30959 + ... + 51597.

Almost surely, 2^851936642 is an apocalyptic number.

851936642 is a deficient number, since it is larger than the sum of its proper divisors (426030241).

851936642 is an frugal number, since it uses more digits than its factorization.

851936642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41280 (or 20641 counting only the distinct ones).

The product of its digits is 311040, while the sum is 44.

The square root of 851936642 is about 29187.9537138183. The cubic root of 851936642 is about 947.9871108943.

The spelling of 851936642 in words is "eight hundred fifty-one million, nine hundred thirty-six thousand, six hundred forty-two".