84556789 has 2 divisors, whose sum is σ = 84556790. Its totient is φ = 84556788.

The previous prime is 84556777. The next prime is 84556841. The reversal of 84556789 is 98765548.

It is an a-pointer prime, because the next prime (84556841) can be obtained adding 84556789 to its sum of digits (52).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74252689 + 10304100 = 8617^2 + 3210^2 .

It is a cyclic number.

It is not a de Polignac number, because 84556789 - 2⁵ = 84556757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84556709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42278394 + 42278395.

It is an arithmetic number, because the mean of its divisors is an integer number (42278395).

Almost surely, 2^84556789 is an apocalyptic number.

It is an amenable number.

84556789 is a deficient number, since it is larger than the sum of its proper divisors (1).

84556789 is an equidigital number, since it uses as much as digits as its factorization.

84556789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2419200, while the sum is 52.

The square root of 84556789 is about 9195.4765510005. The cubic root of 84556789 is about 438.9174298969.

The spelling of 84556789 in words is "eighty-four million, five hundred fifty-six thousand, seven hundred eighty-nine".