1288965889 has 2 divisors, whose sum is σ = 1288965890. Its totient is φ = 1288965888.

The previous prime is 1288965877. The next prime is 1288965919. The reversal of 1288965889 is 9885698821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1152263025 + 136702864 = 33945^2 + 11692^2 .

It is an emirp because it is prime and its reverse (9885698821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1288965889 - 2¹⁷ = 1288834817 is a prime.

It is a super-2 number, since 2×1288965889² = 3322866126011120642, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1288965889.

It is not a weakly prime, because it can be changed into another prime (1288965809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 644482944 + 644482945.

It is an arithmetic number, because the mean of its divisors is an integer number (644482945).

Almost surely, 2^1288965889 is an apocalyptic number.

It is an amenable number.

1288965889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1288965889 is an equidigital number, since it uses as much as digits as its factorization.

1288965889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19906560, while the sum is 64.

The square root of 1288965889 is about 35902.1710903394. The cubic root of 1288965889 is about 1088.2962719613.

The spelling of 1288965889 in words is "one billion, two hundred eighty-eight million, nine hundred sixty-five thousand, eight hundred eighty-nine".