97578916321 has 2 divisors, whose sum is σ = 97578916322. Its totient is φ = 97578916320.

The previous prime is 97578916319. The next prime is 97578916327. The reversal of 97578916321 is 12361987579.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67246862400 + 30332053921 = 259320^2 + 174161^2 .

It is an emirp because it is prime and its reverse (12361987579) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97578916321 - 2¹ = 97578916319 is a prime.

Together with 97578916319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (97578916327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48789458160 + 48789458161.

It is an arithmetic number, because the mean of its divisors is an integer number (48789458161).

Almost surely, 2^97578916321 is an apocalyptic number.

It is an amenable number.

97578916321 is a deficient number, since it is larger than the sum of its proper divisors (1).

97578916321 is an equidigital number, since it uses as much as digits as its factorization.

97578916321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5715360, while the sum is 58.

The spelling of 97578916321 in words is "ninety-seven billion, five hundred seventy-eight million, nine hundred sixteen thousand, three hundred twenty-one".