89405685209 has 2 divisors, whose sum is σ = 89405685210. Its totient is φ = 89405685208.

The previous prime is 89405685197. The next prime is 89405685211. The reversal of 89405685209 is 90258650498.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51313575625 + 38092109584 = 226525^2 + 195172^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-89405685209 is a prime.

Together with 89405685211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (89405688209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44702842604 + 44702842605.

It is an arithmetic number, because the mean of its divisors is an integer number (44702842605).

Almost surely, 2^89405685209 is an apocalyptic number.

It is an amenable number.

89405685209 is a deficient number, since it is larger than the sum of its proper divisors (1).

89405685209 is an equidigital number, since it uses as much as digits as its factorization.

89405685209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6220800, while the sum is 56.

The spelling of 89405685209 in words is "eighty-nine billion, four hundred five million, six hundred eighty-five thousand, two hundred nine".