851363861 has 2 divisors, whose sum is σ = 851363862. Its totient is φ = 851363860.

The previous prime is 851363839. The next prime is 851363869. The reversal of 851363861 is 168363158.

851363861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 602702500 + 248661361 = 24550^2 + 15769^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-851363861 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (851363869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425681930 + 425681931.

It is an arithmetic number, because the mean of its divisors is an integer number (425681931).

Almost surely, 2^851363861 is an apocalyptic number.

It is an amenable number.

851363861 is a deficient number, since it is larger than the sum of its proper divisors (1).

851363861 is an equidigital number, since it uses as much as digits as its factorization.

851363861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 41.

The square root of 851363861 is about 29178.1401223587. The cubic root of 851363861 is about 947.7746104520.

The spelling of 851363861 in words is "eight hundred fifty-one million, three hundred sixty-three thousand, eight hundred sixty-one".