9954443981 has 8 divisors (see below), whose sum is σ = 10298902680. Its totient is φ = 9610065472.

The previous prime is 9954443911. The next prime is 9954444013. The reversal of 9954443981 is 1893444599.

It can be written as a sum of positive squares in 4 ways, for example, as 27510025 + 9926933956 = 5245^2 + 99634^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9954443981 - 2¹⁸ = 9954181837 is a prime.

It is a super-2 number, since 2×9954443981² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9954443911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 346151 + ... + 373803.

It is an arithmetic number, because the mean of its divisors is an integer number (1287362835).

Almost surely, 2^9954443981 is an apocalyptic number.

It is an amenable number.

9954443981 is a deficient number, since it is larger than the sum of its proper divisors (344458699).

9954443981 is a wasteful number, since it uses less digits than its factorization.

9954443981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40095.

The product of its digits is 5598720, while the sum is 56.

The square root of 9954443981 is about 99771.9598935492. The cubic root of 9954443981 is about 2151.1581271555.

The spelling of 9954443981 in words is "nine billion, nine hundred fifty-four million, four hundred forty-three thousand, nine hundred eighty-one".