9124236721 has 2 divisors, whose sum is σ = 9124236722. Its totient is φ = 9124236720.

The previous prime is 9124236707. The next prime is 9124236731. The reversal of 9124236721 is 1276324219.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6160523121 + 2963713600 = 78489^2 + 54440^2 .

It is a cyclic number.

It is not a de Polignac number, because 9124236721 - 2¹¹ = 9124234673 is a prime.

It is not a weakly prime, because it can be changed into another prime (9124236731) 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, 4562118360 + 4562118361.

It is an arithmetic number, because the mean of its divisors is an integer number (4562118361).

Almost surely, 2^9124236721 is an apocalyptic number.

It is an amenable number.

9124236721 is a deficient number, since it is larger than the sum of its proper divisors (1).

9124236721 is an equidigital number, since it uses as much as digits as its factorization.

9124236721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 37.

The square root of 9124236721 is about 95520.8706042821. The cubic root of 9124236721 is about 2089.6113316921.

The spelling of 9124236721 in words is "nine billion, one hundred twenty-four million, two hundred thirty-six thousand, seven hundred twenty-one".