1289884904361 has 27 divisors (see below), whose sum is σ = 1870266181693.
Its totient is φ = 856659178680.
The previous prime is 1289884904359. The next prime is 1289884904377. The reversal of 1289884904361 is 1634094889821.
The square root of 1289884904361 is 1135731.
It is a perfect power (a square), and thus also a powerful number.
1289884904361 is a `hidden beast` number, since 1 + 2 + 8 + 9 + 88 + 490 + 4 + 3 + 61 = 666.
It is not a de Polignac number, because 1289884904361 - 21 = 1289884904359 is a prime.
It is a super-2 number, since 2×12898849043612 (a number of 25 digits) contains 22 as substring.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (1289884904311) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1182295426 + ... + 1182296516.
Almost surely, 21289884904361 is an apocalyptic number.
1289884904361 is the 1135731-st square number.
1289884904361 is the 567866-th centered octagonal number.
It is an amenable number.
1289884904361 is a deficient number, since it is larger than the sum of its proper divisors (580381277332).
1289884904361 is an frugal number, since it uses more digits than its factorization.
1289884904361 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2882 (or 1441 counting only the distinct ones).
The product of its (nonzero) digits is 23887872, while the sum is 63.
The spelling of 1289884904361 in words is "one trillion, two hundred eighty-nine billion, eight hundred eighty-four million, nine hundred four thousand, three hundred sixty-one".