9997348721 has 2 divisors, whose sum is σ = 9997348722. Its totient is φ = 9997348720.

The previous prime is 9997348609. The next prime is 9997348723. The reversal of 9997348721 is 1278437999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9977812321 + 19536400 = 99889^2 + 4420^2 .

It is a cyclic number.

It is not a de Polignac number, because 9997348721 - 2¹⁸ = 9997086577 is a prime.

Together with 9997348723, 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 (9997348723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4998674360 + 4998674361.

It is an arithmetic number, because the mean of its divisors is an integer number (4998674361).

Almost surely, 2^9997348721 is an apocalyptic number.

It is an amenable number.

9997348721 is a deficient number, since it is larger than the sum of its proper divisors (1).

9997348721 is an equidigital number, since it uses as much as digits as its factorization.

9997348721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6858432, while the sum is 59.

The square root of 9997348721 is about 99986.7427262235. The cubic root of 9997348721 is about 2154.2442729542.

The spelling of 9997348721 in words is "nine billion, nine hundred ninety-seven million, three hundred forty-eight thousand, seven hundred twenty-one".