4494991781281 has 8 divisors (see below), whose sum is σ = 4537021566440. Its totient is φ = 4452976384128.

The previous prime is 4494991781213. The next prime is 4494991781341. The reversal of 4494991781281 is 1821871994944.

It can be written as a sum of positive squares in 4 ways, for example, as 131739235681 + 4363252545600 = 362959^2 + 2088840^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 4494991781281 - 2¹¹ = 4494991779233 is a prime.

It is a super-2 number, since 2×4494991781281² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4494991781201) 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 7 ways as a sum of consecutive naturals, for example, 2968746 + ... + 4219411.

It is an arithmetic number, because the mean of its divisors is an integer number (567127695805).

Almost surely, 2^{4494991781281} is an apocalyptic number.

It is an amenable number.

4494991781281 is a deficient number, since it is larger than the sum of its proper divisors (42029785159).

4494991781281 is a wasteful number, since it uses less digits than its factorization.

4494991781281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7194003.

The product of its digits is 41803776, while the sum is 67.

The spelling of 4494991781281 in words is "four trillion, four hundred ninety-four billion, nine hundred ninety-one million, seven hundred eighty-one thousand, two hundred eighty-one".