1289145189 has 8 divisors (see below), whose sum is σ = 1719290752. Its totient is φ = 859214880.

The previous prime is 1289145181. The next prime is 1289145197. The reversal of 1289145189 is 9815419821.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1289145181) and next prime (1289145197).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1289145189 - 2³ = 1289145181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1289145181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39277 + ... + 64194.

It is an arithmetic number, because the mean of its divisors is an integer number (214911344).

Almost surely, 2^1289145189 is an apocalyptic number.

It is an amenable number.

1289145189 is a deficient number, since it is larger than the sum of its proper divisors (430145563).

1289145189 is a wasteful number, since it uses less digits than its factorization.

1289145189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107627.

The product of its digits is 207360, while the sum is 48.

The square root of 1289145189 is about 35904.6680669798. The cubic root of 1289145189 is about 1088.3467316557.

The spelling of 1289145189 in words is "one billion, two hundred eighty-nine million, one hundred forty-five thousand, one hundred eighty-nine".