9447779081 has 16 divisors (see below), whose sum is σ = 10396729728. Its totient is φ = 8532451200.

The previous prime is 9447779071. The next prime is 9447779111. The reversal of 9447779081 is 1809777449.

It is not a de Polignac number, because 9447779081 - 2¹⁸ = 9447516937 is a prime.

It is a super-2 number, since 2×9447779081² (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 (9447779021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81845 + ... + 159981.

It is an arithmetic number, because the mean of its divisors is an integer number (649795608).

Almost surely, 2^9447779081 is an apocalyptic number.

It is an amenable number.

9447779081 is a deficient number, since it is larger than the sum of its proper divisors (948950647).

9447779081 is a wasteful number, since it uses less digits than its factorization.

9447779081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78352.

The product of its (nonzero) digits is 3556224, while the sum is 56.

The square root of 9447779081 is about 97199.6866301533. The cubic root of 9447779081 is about 2114.0239825196.

The spelling of 9447779081 in words is "nine billion, four hundred forty-seven million, seven hundred seventy-nine thousand, eighty-one".