9912219137 has 2 divisors, whose sum is σ = 9912219138. Its totient is φ = 9912219136.

The previous prime is 9912219071. The next prime is 9912219139. The reversal of 9912219137 is 7319122199.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6380175376 + 3532043761 = 79876^2 + 59431^2 .

It is an emirp because it is prime and its reverse (7319122199) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9912219137 - 2²⁶ = 9845110273 is a prime.

Together with 9912219139, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9912219139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4956109568 + 4956109569.

It is an arithmetic number, because the mean of its divisors is an integer number (4956109569).

Almost surely, 2^9912219137 is an apocalyptic number.

It is an amenable number.

9912219137 is a deficient number, since it is larger than the sum of its proper divisors (1).

9912219137 is an equidigital number, since it uses as much as digits as its factorization.

9912219137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236, while the sum is 44.

The square root of 9912219137 is about 99560.1282492143. The cubic root of 9912219137 is about 2148.1122161661.

The spelling of 9912219137 in words is "nine billion, nine hundred twelve million, two hundred nineteen thousand, one hundred thirty-seven".