7538942321 has 2 divisors, whose sum is σ = 7538942322. Its totient is φ = 7538942320.

The previous prime is 7538942311. The next prime is 7538942339. The reversal of 7538942321 is 1232498357.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6665089600 + 873852721 = 81640^2 + 29561^2 .

It is an emirp because it is prime and its reverse (1232498357) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7538942321 - 2²² = 7534748017 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (7538942311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3769471160 + 3769471161.

It is an arithmetic number, because the mean of its divisors is an integer number (3769471161).

Almost surely, 2^7538942321 is an apocalyptic number.

It is an amenable number.

7538942321 is a deficient number, since it is larger than the sum of its proper divisors (1).

7538942321 is an equidigital number, since it uses as much as digits as its factorization.

7538942321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 44.

The square root of 7538942321 is about 86827.0828774064. The cubic root of 7538942321 is about 1960.8158412074.

The spelling of 7538942321 in words is "seven billion, five hundred thirty-eight million, nine hundred forty-two thousand, three hundred twenty-one".