1444416981921 has 27 divisors (see below), whose sum is σ = 2156020555377. Its totient is φ = 931809813480.

The previous prime is 1444416981911. The next prime is 1444416981941. The reversal of 1444416981921 is 1291896144441.

The square root of 1444416981921 is 1201839.

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

1444416981921 is a `hidden beast` number, since 1 + 4 + 4 + 441 + 6 + 9 + 8 + 192 + 1 = 666.

It is not a de Polignac number, because 1444416981921 - 2¹⁵ = 1444416949153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1444416981901) 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, 111764566 + ... + 111777488.

Almost surely, 2^{1444416981921} is an apocalyptic number.

1444416981921 is the 1201839-th square number.

1444416981921 is the 600920-th centered octagonal number.

It is an amenable number.

1444416981921 is a deficient number, since it is larger than the sum of its proper divisors (711603573456).

1444416981921 is an frugal number, since it uses more digits than its factorization.

1444416981921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25914 (or 12957 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 54.

The spelling of 1444416981921 in words is "one trillion, four hundred forty-four billion, four hundred sixteen million, nine hundred eighty-one thousand, nine hundred twenty-one".