194979448397 has 2 divisors, whose sum is σ = 194979448398. Its totient is φ = 194979448396.

The previous prime is 194979448387. The next prime is 194979448403. The reversal of 194979448397 is 793844979491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166452576196 + 28526872201 = 407986^2 + 168899^2 .

It is a cyclic number.

It is not a de Polignac number, because 194979448397 - 2⁶ = 194979448333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194979448387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97489724198 + 97489724199.

It is an arithmetic number, because the mean of its divisors is an integer number (97489724199).

Almost surely, 2^194979448397 is an apocalyptic number.

It is an amenable number.

194979448397 is a deficient number, since it is larger than the sum of its proper divisors (1).

194979448397 is an equidigital number, since it uses as much as digits as its factorization.

194979448397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 493807104, while the sum is 74.

The spelling of 194979448397 in words is "one hundred ninety-four billion, nine hundred seventy-nine million, four hundred forty-eight thousand, three hundred ninety-seven".