97981319321 has 2 divisors, whose sum is σ = 97981319322. Its totient is φ = 97981319320.

The previous prime is 97981319297. The next prime is 97981319339. The reversal of 97981319321 is 12391318979.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92613705625 + 5367613696 = 304325^2 + 73264^2 .

It is a cyclic number.

It is not a de Polignac number, because 97981319321 - 2³⁴ = 80801450137 is a prime.

It is not a weakly prime, because it can be changed into another prime (97981319341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48990659660 + 48990659661.

It is an arithmetic number, because the mean of its divisors is an integer number (48990659661).

Almost surely, 2^97981319321 is an apocalyptic number.

It is an amenable number.

97981319321 is a deficient number, since it is larger than the sum of its proper divisors (1).

97981319321 is an equidigital number, since it uses as much as digits as its factorization.

97981319321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 734832, while the sum is 53.

The spelling of 97981319321 in words is "ninety-seven billion, nine hundred eighty-one million, three hundred nineteen thousand, three hundred twenty-one".