391938190313 has 2 divisors, whose sum is σ = 391938190314. Its totient is φ = 391938190312.

The previous prime is 391938190291. The next prime is 391938190349. The reversal of 391938190313 is 313091839193.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210008643289 + 181929547024 = 458267^2 + 426532^2 .

It is a cyclic number.

It is not a de Polignac number, because 391938190313 - 2⁶ = 391938190249 is a prime.

It is not a weakly prime, because it can be changed into another prime (391938190013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195969095156 + 195969095157.

It is an arithmetic number, because the mean of its divisors is an integer number (195969095157).

Almost surely, 2^391938190313 is an apocalyptic number.

It is an amenable number.

391938190313 is a deficient number, since it is larger than the sum of its proper divisors (1).

391938190313 is an equidigital number, since it uses as much as digits as its factorization.

391938190313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 472392, while the sum is 50.

The spelling of 391938190313 in words is "three hundred ninety-one billion, nine hundred thirty-eight million, one hundred ninety thousand, three hundred thirteen".