1289428816173 has 4 divisors (see below), whose sum is σ = 1719238421568. Its totient is φ = 859619210780.

The previous prime is 1289428816139. The next prime is 1289428816199. The reversal of 1289428816173 is 3716188249821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1289428816173 - 2²² = 1289424621869 is a prime.

It is a super-3 number, since 3×1289428816173³ (a number of 37 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1289428816573) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214904802693 + ... + 214904802698.

It is an arithmetic number, because the mean of its divisors is an integer number (429809605392).

Almost surely, 2^{1289428816173} is an apocalyptic number.

It is an amenable number.

1289428816173 is a deficient number, since it is larger than the sum of its proper divisors (429809605395).

1289428816173 is an equidigital number, since it uses as much as digits as its factorization.

1289428816173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429809605394.

The product of its digits is 9289728, while the sum is 60.

The spelling of 1289428816173 in words is "one trillion, two hundred eighty-nine billion, four hundred twenty-eight million, eight hundred sixteen thousand, one hundred seventy-three".