9101159981 has 2 divisors, whose sum is σ = 9101159982. Its totient is φ = 9101159980.

The previous prime is 9101159971. The next prime is 9101160023. The reversal of 9101159981 is 1899511019.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8767513225 + 333646756 = 93635^2 + 18266^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9101159981 is a prime.

It is a super-2 number, since 2×9101159981² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9101159911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4550579990 + 4550579991.

It is an arithmetic number, because the mean of its divisors is an integer number (4550579991).

Almost surely, 2^9101159981 is an apocalyptic number.

It is an amenable number.

9101159981 is a deficient number, since it is larger than the sum of its proper divisors (1).

9101159981 is an equidigital number, since it uses as much as digits as its factorization.

9101159981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 44.

The square root of 9101159981 is about 95399.9999004193. Note that the first 4 decimals coincide. The cubic root of 9101159981 is about 2087.8481841006.

The spelling of 9101159981 in words is "nine billion, one hundred one million, one hundred fifty-nine thousand, nine hundred eighty-one".