9138207121 has 2 divisors, whose sum is σ = 9138207122. Its totient is φ = 9138207120.

The previous prime is 9138207037. The next prime is 9138207131. The reversal of 9138207121 is 1217028319.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6652686096 + 2485521025 = 81564^2 + 49855^2 .

It is a cyclic number.

It is not a de Polignac number, because 9138207121 - 2¹¹ = 9138205073 is a prime.

It is not a weakly prime, because it can be changed into another prime (9138207131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4569103560 + 4569103561.

It is an arithmetic number, because the mean of its divisors is an integer number (4569103561).

Almost surely, 2^9138207121 is an apocalyptic number.

It is an amenable number.

9138207121 is a deficient number, since it is larger than the sum of its proper divisors (1).

9138207121 is an equidigital number, since it uses as much as digits as its factorization.

9138207121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 9138207121 is about 95593.9701079519. The cubic root of 9138207121 is about 2090.6772772763.

The spelling of 9138207121 in words is "nine billion, one hundred thirty-eight million, two hundred seven thousand, one hundred twenty-one".