84911581169 has 2 divisors, whose sum is σ = 84911581170. Its totient is φ = 84911581168.

The previous prime is 84911581159. The next prime is 84911581187. The reversal of 84911581169 is 96118511948.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60289891600 + 24621689569 = 245540^2 + 156913^2 .

It is a cyclic number.

It is not a de Polignac number, because 84911581169 - 2⁸ = 84911580913 is a prime.

It is a super-2 number, since 2×84911581169² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 84911581169.

It is not a weakly prime, because it can be changed into another prime (84911581159) 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, 42455790584 + 42455790585.

It is an arithmetic number, because the mean of its divisors is an integer number (42455790585).

Almost surely, 2^84911581169 is an apocalyptic number.

It is an amenable number.

84911581169 is a deficient number, since it is larger than the sum of its proper divisors (1).

84911581169 is an equidigital number, since it uses as much as digits as its factorization.

84911581169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 53.

The spelling of 84911581169 in words is "eighty-four billion, nine hundred eleven million, five hundred eighty-one thousand, one hundred sixty-nine".