8912115217 has 2 divisors, whose sum is σ = 8912115218. Its totient is φ = 8912115216.

The previous prime is 8912115211. The next prime is 8912115221. The reversal of 8912115217 is 7125112198.

It is a Cunningham number, because it is equal to 94404²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8912115216 + 1 = 94404^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 8912115217 - 2³¹ = 6764631569 is a prime.

It is not a weakly prime, because it can be changed into another prime (8912115211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4456057608 + 4456057609.

It is an arithmetic number, because the mean of its divisors is an integer number (4456057609).

Almost surely, 2^8912115217 is an apocalyptic number.

It is an amenable number.

8912115217 is a deficient number, since it is larger than the sum of its proper divisors (1).

8912115217 is an equidigital number, since it uses as much as digits as its factorization.

8912115217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 37.

The square root of 8912115217 is about 94404.0000052964. Note that the first 5 decimals coincide. The cubic root of 8912115217 is about 2073.2910081522.

The spelling of 8912115217 in words is "eight billion, nine hundred twelve million, one hundred fifteen thousand, two hundred seventeen".