8446819981 has 4 divisors (see below), whose sum is σ = 8530451964. Its totient is φ = 8363188000.

The previous prime is 8446819963. The next prime is 8446820029. The reversal of 8446819981 is 1899186448.

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 6283732900 + 2163087081 = 79270^2 + 46509^2 .

It is a cyclic number.

It is not a de Polignac number, because 8446819981 - 2³¹ = 6299336333 is a prime.

It is a super-2 number, since 2×8446819981² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8446819951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41815840 + ... + 41816041.

It is an arithmetic number, because the mean of its divisors is an integer number (2132612991).

Almost surely, 2^8446819981 is an apocalyptic number.

It is an amenable number.

8446819981 is a deficient number, since it is larger than the sum of its proper divisors (83631983).

8446819981 is a wasteful number, since it uses less digits than its factorization.

8446819981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83631982.

The product of its digits is 3981312, while the sum is 58.

The square root of 8446819981 is about 91906.5829035113. The cubic root of 8446819981 is about 2036.5625164925.

The spelling of 8446819981 in words is "eight billion, four hundred forty-six million, eight hundred nineteen thousand, nine hundred eighty-one".