861718089 has 4 divisors (see below), whose sum is σ = 1148957456. Its totient is φ = 574478724.

The previous prime is 861718087. The next prime is 861718103. The reversal of 861718089 is 980817168.

861718089 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 861718089 - 2¹ = 861718087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (861718087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143619679 + ... + 143619684.

It is an arithmetic number, because the mean of its divisors is an integer number (287239364).

Almost surely, 2^861718089 is an apocalyptic number.

It is an amenable number.

861718089 is a deficient number, since it is larger than the sum of its proper divisors (287239367).

861718089 is a wasteful number, since it uses less digits than its factorization.

861718089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287239366.

The product of its (nonzero) digits is 193536, while the sum is 48.

The square root of 861718089 is about 29355.0351558297. The cubic root of 861718089 is about 951.6013947066.

The spelling of 861718089 in words is "eight hundred sixty-one million, seven hundred eighteen thousand, eighty-nine".