89181681817 has 2 divisors, whose sum is σ = 89181681818. Its totient is φ = 89181681816.

The previous prime is 89181681793. The next prime is 89181681833. The reversal of 89181681817 is 71818618198.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75495255696 + 13686426121 = 274764^2 + 116989^2 .

It is a cyclic number.

It is not a de Polignac number, because 89181681817 - 2²⁷ = 89047464089 is a prime.

It is not a weakly prime, because it can be changed into another prime (89181681877) 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, 44590840908 + 44590840909.

It is an arithmetic number, because the mean of its divisors is an integer number (44590840909).

Almost surely, 2^89181681817 is an apocalyptic number.

It is an amenable number.

89181681817 is a deficient number, since it is larger than the sum of its proper divisors (1).

89181681817 is an equidigital number, since it uses as much as digits as its factorization.

89181681817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1548288, while the sum is 58.

The spelling of 89181681817 in words is "eighty-nine billion, one hundred eighty-one million, six hundred eighty-one thousand, eight hundred seventeen".