1889280489121 has 3 divisors (see below), whose sum is σ = 1889281863633. Its totient is φ = 1889279114610.

The previous prime is 1889280489119. The next prime is 1889280489127. The reversal of 1889280489121 is 1219840829881.

The square root of 1889280489121 is 1374511.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 1889280489121 - 2¹ = 1889280489119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1889280489121.

It is not an unprimeable number, because it can be changed into a prime (1889280489127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 687256 + ... + 2061766.

It is an arithmetic number, because the mean of its divisors is an integer number (629760621211).

Almost surely, 2^{1889280489121} is an apocalyptic number.

1889280489121 is the 1374511-st square number.

1889280489121 is the 687256-th centered octagonal number.

It is an amenable number.

1889280489121 is a deficient number, since it is larger than the sum of its proper divisors (1374512).

1889280489121 is an frugal number, since it uses more digits than its factorization.

1889280489121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2749022 (or 1374511 counting only the distinct ones).

The product of its (nonzero) digits is 5308416, while the sum is 61.

The spelling of 1889280489121 in words is "one trillion, eight hundred eighty-nine billion, two hundred eighty million, four hundred eighty-nine thousand, one hundred twenty-one".