89811643489 has 2 divisors, whose sum is σ = 89811643490. Its totient is φ = 89811643488.

The previous prime is 89811643391. The next prime is 89811643511. The reversal of 89811643489 is 98434611898.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71880291025 + 17931352464 = 268105^2 + 133908^2 .

It is a cyclic number.

It is not a de Polignac number, because 89811643489 - 2¹⁹ = 89811119201 is a prime.

It is a super-2 number, since 2×89811643489² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (89811640489) 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, 44905821744 + 44905821745.

It is an arithmetic number, because the mean of its divisors is an integer number (44905821745).

Almost surely, 2^89811643489 is an apocalyptic number.

It is an amenable number.

89811643489 is a deficient number, since it is larger than the sum of its proper divisors (1).

89811643489 is an equidigital number, since it uses as much as digits as its factorization.

89811643489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11943936, while the sum is 61.

The spelling of 89811643489 in words is "eighty-nine billion, eight hundred eleven million, six hundred forty-three thousand, four hundred eighty-nine".