861084853 has 2 divisors, whose sum is σ = 861084854. Its totient is φ = 861084852.

The previous prime is 861084821. The next prime is 861084929. The reversal of 861084853 is 358480168.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 697065604 + 164019249 = 26402^2 + 12807^2 .

It is a cyclic number.

It is not a de Polignac number, because 861084853 - 2⁵ = 861084821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861084053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430542426 + 430542427.

It is an arithmetic number, because the mean of its divisors is an integer number (430542427).

Almost surely, 2^861084853 is an apocalyptic number.

It is an amenable number.

861084853 is a deficient number, since it is larger than the sum of its proper divisors (1).

861084853 is an equidigital number, since it uses as much as digits as its factorization.

861084853 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 184320, while the sum is 43.

The square root of 861084853 is about 29344.2473578724. The cubic root of 861084853 is about 951.3682419182.

The spelling of 861084853 in words is "eight hundred sixty-one million, eighty-four thousand, eight hundred fifty-three".