8999681489 has 2 divisors, whose sum is σ = 8999681490. Its totient is φ = 8999681488.

The previous prime is 8999681479. The next prime is 8999681519. The reversal of 8999681489 is 9841869998.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8274995089 + 724686400 = 90967^2 + 26920^2 .

It is a cyclic number.

It is not a de Polignac number, because 8999681489 - 2⁸ = 8999681233 is a prime.

It is not a weakly prime, because it can be changed into another prime (8999681429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4499840744 + 4499840745.

It is an arithmetic number, because the mean of its divisors is an integer number (4499840745).

Almost surely, 2^8999681489 is an apocalyptic number.

It is an amenable number.

8999681489 is a deficient number, since it is larger than the sum of its proper divisors (1).

8999681489 is an equidigital number, since it uses as much as digits as its factorization.

8999681489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80621568, while the sum is 71.

The square root of 8999681489 is about 94866.6510898324. The cubic root of 8999681489 is about 2080.0592846299.

The spelling of 8999681489 in words is "eight billion, nine hundred ninety-nine million, six hundred eighty-one thousand, four hundred eighty-nine".