861043973 has 2 divisors, whose sum is σ = 861043974. Its totient is φ = 861043972.

The previous prime is 861043933. The next prime is 861043987. The reversal of 861043973 is 379340168.

861043973 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., 493861729 + 367182244 = 22223^2 + 19162^2 .

It is a cyclic number.

It is not a de Polignac number, because 861043973 - 2⁸ = 861043717 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 861043973.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861043903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430521986 + 430521987.

It is an arithmetic number, because the mean of its divisors is an integer number (430521987).

Almost surely, 2^861043973 is an apocalyptic number.

It is an amenable number.

861043973 is a deficient number, since it is larger than the sum of its proper divisors (1).

861043973 is an equidigital number, since it uses as much as digits as its factorization.

861043973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 861043973 is about 29343.5507905911. The cubic root of 861043973 is about 951.3531862788.

The spelling of 861043973 in words is "eight hundred sixty-one million, forty-three thousand, nine hundred seventy-three".