9889009181 has 2 divisors, whose sum is σ = 9889009182. Its totient is φ = 9889009180.

The previous prime is 9889009099. The next prime is 9889009231. The reversal of 9889009181 is 1819009889.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9630281956 + 258727225 = 98134^2 + 16085^2 .

It is an emirp because it is prime and its reverse (1819009889) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9889009181 is a prime.

It is a super-2 number, since 2×9889009181² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9889009981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4944504590 + 4944504591.

It is an arithmetic number, because the mean of its divisors is an integer number (4944504591).

Almost surely, 2^9889009181 is an apocalyptic number.

It is an amenable number.

9889009181 is a deficient number, since it is larger than the sum of its proper divisors (1).

9889009181 is an equidigital number, since it uses as much as digits as its factorization.

9889009181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 53.

The square root of 9889009181 is about 99443.4974294448. The cubic root of 9889009181 is about 2146.4342684832.

The spelling of 9889009181 in words is "nine billion, eight hundred eighty-nine million, nine thousand, one hundred eighty-one".