128107489 has 2 divisors, whose sum is σ = 128107490. Its totient is φ = 128107488.

The previous prime is 128107459. The next prime is 128107541. The reversal of 128107489 is 984701821.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81595089 + 46512400 = 9033^2 + 6820^2 .

It is a cyclic number.

It is not a de Polignac number, because 128107489 - 2⁹ = 128106977 is a prime.

It is not a weakly prime, because it can be changed into another prime (128107439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64053744 + 64053745.

It is an arithmetic number, because the mean of its divisors is an integer number (64053745).

Almost surely, 2^128107489 is an apocalyptic number.

It is an amenable number.

128107489 is a deficient number, since it is larger than the sum of its proper divisors (1).

128107489 is an equidigital number, since it uses as much as digits as its factorization.

128107489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 128107489 is about 11318.4578896597. The cubic root of 128107489 is about 504.1094509607.

The spelling of 128107489 in words is "one hundred twenty-eight million, one hundred seven thousand, four hundred eighty-nine".