391579539641 has 2 divisors, whose sum is σ = 391579539642. Its totient is φ = 391579539640.

The previous prime is 391579539619. The next prime is 391579539691. The reversal of 391579539641 is 146935975193.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 391469205625 + 110334016 = 625675^2 + 10504^2 .

It is a cyclic number.

It is not a de Polignac number, because 391579539641 - 2¹⁰ = 391579538617 is a prime.

It is not a weakly prime, because it can be changed into another prime (391579539691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195789769820 + 195789769821.

It is an arithmetic number, because the mean of its divisors is an integer number (195789769821).

Almost surely, 2^391579539641 is an apocalyptic number.

It is an amenable number.

391579539641 is a deficient number, since it is larger than the sum of its proper divisors (1).

391579539641 is an equidigital number, since it uses as much as digits as its factorization.

391579539641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27556200, while the sum is 62.

The spelling of 391579539641 in words is "three hundred ninety-one billion, five hundred seventy-nine million, five hundred thirty-nine thousand, six hundred forty-one".