9212115649817 has 2 divisors, whose sum is σ = 9212115649818. Its totient is φ = 9212115649816.

The previous prime is 9212115649811. The next prime is 9212115649879. The reversal of 9212115649817 is 7189465112129.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4862955554521 + 4349160095296 = 2205211^2 + 2085464^2 .

It is a cyclic number.

It is not a de Polignac number, because 9212115649817 - 2¹⁶ = 9212115584281 is a prime.

It is not a weakly prime, because it can be changed into another prime (9212115649811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4606057824908 + 4606057824909.

It is an arithmetic number, because the mean of its divisors is an integer number (4606057824909).

Almost surely, 2^{9212115649817} is an apocalyptic number.

It is an amenable number.

9212115649817 is a deficient number, since it is larger than the sum of its proper divisors (1).

9212115649817 is an equidigital number, since it uses as much as digits as its factorization.

9212115649817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 56.

The spelling of 9212115649817 in words is "nine trillion, two hundred twelve billion, one hundred fifteen million, six hundred forty-nine thousand, eight hundred seventeen".