9819178081 has 2 divisors, whose sum is σ = 9819178082. Its totient is φ = 9819178080.

The previous prime is 9819178069. The next prime is 9819178129. The reversal of 9819178081 is 1808719189.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7136870400 + 2682307681 = 84480^2 + 51791^2 .

It is a cyclic number.

It is not a de Polignac number, because 9819178081 - 2¹⁷ = 9819047009 is a prime.

It is a super-2 number, since 2×9819178081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9819178001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4909589040 + 4909589041.

It is an arithmetic number, because the mean of its divisors is an integer number (4909589041).

Almost surely, 2^9819178081 is an apocalyptic number.

It is an amenable number.

9819178081 is a deficient number, since it is larger than the sum of its proper divisors (1).

9819178081 is an equidigital number, since it uses as much as digits as its factorization.

9819178081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 52.

The square root of 9819178081 is about 99091.7659596397. The cubic root of 9819178081 is about 2141.3699907484.

The spelling of 9819178081 in words is "nine billion, eight hundred nineteen million, one hundred seventy-eight thousand, eighty-one".