9997502321 has 2 divisors, whose sum is σ = 9997502322. Its totient is φ = 9997502320.

The previous prime is 9997502257. The next prime is 9997502401. The reversal of 9997502321 is 1232057999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7247968225 + 2749534096 = 85135^2 + 52436^2 .

It is an emirp because it is prime and its reverse (1232057999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9997502321 - 2⁶ = 9997502257 is a prime.

It is not a weakly prime, because it can be changed into another prime (9997505321) 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, 4998751160 + 4998751161.

It is an arithmetic number, because the mean of its divisors is an integer number (4998751161).

Almost surely, 2^9997502321 is an apocalyptic number.

It is an amenable number.

9997502321 is a deficient number, since it is larger than the sum of its proper divisors (1).

9997502321 is an equidigital number, since it uses as much as digits as its factorization.

9997502321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 306180, while the sum is 47.

The square root of 9997502321 is about 99987.5108251026. The cubic root of 9997502321 is about 2154.2553055535.

The spelling of 9997502321 in words is "nine billion, nine hundred ninety-seven million, five hundred two thousand, three hundred twenty-one".