97979178313 has 2 divisors, whose sum is σ = 97979178314. Its totient is φ = 97979178312.

The previous prime is 97979178293. The next prime is 97979178373. The reversal of 97979178313 is 31387197979.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76771663929 + 21207514384 = 277077^2 + 145628^2 .

It is an emirp because it is prime and its reverse (31387197979) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97979178313 - 2⁹ = 97979177801 is a prime.

It is not a weakly prime, because it can be changed into another prime (97979178373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48989589156 + 48989589157.

It is an arithmetic number, because the mean of its divisors is an integer number (48989589157).

Almost surely, 2^97979178313 is an apocalyptic number.

It is an amenable number.

97979178313 is a deficient number, since it is larger than the sum of its proper divisors (1).

97979178313 is an equidigital number, since it uses as much as digits as its factorization.

97979178313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18003384, while the sum is 64.

The spelling of 97979178313 in words is "ninety-seven billion, nine hundred seventy-nine million, one hundred seventy-eight thousand, three hundred thirteen".