9111212137 has 2 divisors, whose sum is σ = 9111212138. Its totient is φ = 9111212136.

The previous prime is 9111212081. The next prime is 9111212153. The reversal of 9111212137 is 7312121119.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6866442496 + 2244769641 = 82864^2 + 47379^2 .

It is an emirp because it is prime and its reverse (7312121119) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9111212137 - 2¹⁵ = 9111179369 is a prime.

It is a super-2 number, since 2×9111212137² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9111212197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4555606068 + 4555606069.

It is an arithmetic number, because the mean of its divisors is an integer number (4555606069).

Almost surely, 2^9111212137 is an apocalyptic number.

It is an amenable number.

9111212137 is a deficient number, since it is larger than the sum of its proper divisors (1).

9111212137 is an equidigital number, since it uses as much as digits as its factorization.

9111212137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756, while the sum is 28.

The square root of 9111212137 is about 95452.6696169363. The cubic root of 9111212137 is about 2088.6165716335.

The spelling of 9111212137 in words is "nine billion, one hundred eleven million, two hundred twelve thousand, one hundred thirty-seven".