1289387369 has 2 divisors, whose sum is σ = 1289387370. Its totient is φ = 1289387368.

The previous prime is 1289387279. The next prime is 1289387381. The reversal of 1289387369 is 9637839821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1234819600 + 54567769 = 35140^2 + 7387^2 .

It is an emirp because it is prime and its reverse (9637839821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1289387369 is a prime.

It is a super-2 number, since 2×1289387369² = 3325039574673484322, which 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 (1289387399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 644693684 + 644693685.

It is an arithmetic number, because the mean of its divisors is an integer number (644693685).

Almost surely, 2^1289387369 is an apocalyptic number.

It is an amenable number.

1289387369 is a deficient number, since it is larger than the sum of its proper divisors (1).

1289387369 is an equidigital number, since it uses as much as digits as its factorization.

1289387369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3919104, while the sum is 56.

The square root of 1289387369 is about 35908.0404505732. The cubic root of 1289387369 is about 1088.4148799941.

The spelling of 1289387369 in words is "one billion, two hundred eighty-nine million, three hundred eighty-seven thousand, three hundred sixty-nine".