861332789 has 2 divisors, whose sum is σ = 861332790. Its totient is φ = 861332788.

The previous prime is 861332779. The next prime is 861332807. The reversal of 861332789 is 987233168.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 612166564 + 249166225 = 24742^2 + 15785^2 .

It is a cyclic number.

It is not a de Polignac number, because 861332789 - 2⁸ = 861332533 is a prime.

It is a super-3 number, since 3×861332789³ (a number of 28 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861332779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430666394 + 430666395.

It is an arithmetic number, because the mean of its divisors is an integer number (430666395).

Almost surely, 2^861332789 is an apocalyptic number.

It is an amenable number.

861332789 is a deficient number, since it is larger than the sum of its proper divisors (1).

861332789 is an equidigital number, since it uses as much as digits as its factorization.

861332789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 47.

The square root of 861332789 is about 29348.4716637852. The cubic root of 861332789 is about 951.4595437220.

The spelling of 861332789 in words is "eight hundred sixty-one million, three hundred thirty-two thousand, seven hundred eighty-nine".