1984331447569 has 3 divisors (see below), whose sum is σ = 1984332856233. Its totient is φ = 1984330038906.

The previous prime is 1984331447543. The next prime is 1984331447587. The reversal of 1984331447569 is 9657441334891.

It is a happy number.

The square root of 1984331447569 is 1408663.

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 a de Polignac number, because none of the positive numbers 2^k-1984331447569 is a prime.

It is a super-2 number, since 2×1984331447569² (a number of 25 digits) contains 22 as substring.

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 1984331447569.

It is not an unprimeable number, because it can be changed into a prime (1984331447669) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 704332 + ... + 2112994.

It is an arithmetic number, because the mean of its divisors is an integer number (661444285411).

Almost surely, 2^{1984331447569} is an apocalyptic number.

1984331447569 is the 1408663-rd square number.

1984331447569 is the 704332-nd centered octagonal number.

It is an amenable number.

1984331447569 is a deficient number, since it is larger than the sum of its proper divisors (1408664).

1984331447569 is an frugal number, since it uses more digits than its factorization.

1984331447569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2817326 (or 1408663 counting only the distinct ones).

The product of its digits is 78382080, while the sum is 64.

Multiplying 1984331447569 by its sum of digits (64), we get a square (126997212644416 = 11269304²).

The spelling of 1984331447569 in words is "one trillion, nine hundred eighty-four billion, three hundred thirty-one million, four hundred forty-seven thousand, five hundred sixty-nine".