9723838121 has 2 divisors, whose sum is σ = 9723838122. Its totient is φ = 9723838120.

The previous prime is 9723838097. The next prime is 9723838123. The reversal of 9723838121 is 1218383279.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9592047721 + 131790400 = 97939^2 + 11480^2 .

It is a cyclic number.

It is not a de Polignac number, because 9723838121 - 2¹⁸ = 9723575977 is a prime.

Together with 9723838123, 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 (9723838123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4861919060 + 4861919061.

It is an arithmetic number, because the mean of its divisors is an integer number (4861919061).

Almost surely, 2^9723838121 is an apocalyptic number.

It is an amenable number.

9723838121 is a deficient number, since it is larger than the sum of its proper divisors (1).

9723838121 is an equidigital number, since it uses as much as digits as its factorization.

9723838121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 44.

The square root of 9723838121 is about 98609.5234802400. The cubic root of 9723838121 is about 2134.4168466939.

The spelling of 9723838121 in words is "nine billion, seven hundred twenty-three million, eight hundred thirty-eight thousand, one hundred twenty-one".