1289128963 has 2 divisors, whose sum is σ = 1289128964. Its totient is φ = 1289128962.

The previous prime is 1289128961. The next prime is 1289128979. The reversal of 1289128963 is 3698219821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1289128963 - 2¹ = 1289128961 is a prime.

Together with 1289128961, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1289128961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 644564481 + 644564482.

It is an arithmetic number, because the mean of its divisors is an integer number (644564482).

Almost surely, 2^1289128963 is an apocalyptic number.

1289128963 is a deficient number, since it is larger than the sum of its proper divisors (1).

1289128963 is an equidigital number, since it uses as much as digits as its factorization.

1289128963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 49.

The square root of 1289128963 is about 35904.4421067923. The cubic root of 1289128963 is about 1088.3421654288.

The spelling of 1289128963 in words is "one billion, two hundred eighty-nine million, one hundred twenty-eight thousand, nine hundred sixty-three".