9994409881 has 4 divisors (see below), whose sum is σ = 9995218612. Its totient is φ = 9993601152.

The previous prime is 9994409801. The next prime is 9994409921. The reversal of 9994409881 is 1889044999.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8155715481 + 1838694400 = 90309^2 + 42880^2 .

It is a cyclic number.

It is not a de Polignac number, because 9994409881 - 2⁷ = 9994409753 is a prime.

It is a super-2 number, since 2×9994409881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9994409801) 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 3 ways as a sum of consecutive naturals, for example, 385536 + ... + 410641.

It is an arithmetic number, because the mean of its divisors is an integer number (2498804653).

Almost surely, 2^9994409881 is an apocalyptic number.

It is an amenable number.

9994409881 is a deficient number, since it is larger than the sum of its proper divisors (808731).

9994409881 is a wasteful number, since it uses less digits than its factorization.

9994409881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808730.

The product of its (nonzero) digits is 6718464, while the sum is 61.

The square root of 9994409881 is about 99972.0454977290. The cubic root of 9994409881 is about 2154.0331636601.

The spelling of 9994409881 in words is "nine billion, nine hundred ninety-four million, four hundred nine thousand, eight hundred eighty-one".