89664231281 has 2 divisors, whose sum is σ = 89664231282. Its totient is φ = 89664231280.

The previous prime is 89664231277. The next prime is 89664231317. The reversal of 89664231281 is 18213246698.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86098230625 + 3566000656 = 293425^2 + 59716^2 .

It is a cyclic number.

It is not a de Polignac number, because 89664231281 - 2² = 89664231277 is a prime.

It is a super-2 number, since 2×89664231281² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (89664231781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44832115640 + 44832115641.

It is an arithmetic number, because the mean of its divisors is an integer number (44832115641).

Almost surely, 2^89664231281 is an apocalyptic number.

It is an amenable number.

89664231281 is a deficient number, since it is larger than the sum of its proper divisors (1).

89664231281 is an equidigital number, since it uses as much as digits as its factorization.

89664231281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 995328, while the sum is 50.

The spelling of 89664231281 in words is "eighty-nine billion, six hundred sixty-four million, two hundred thirty-one thousand, two hundred eighty-one".