391785044041 has 2 divisors, whose sum is σ = 391785044042. Its totient is φ = 391785044040.

The previous prime is 391785044033. The next prime is 391785044051. The reversal of 391785044041 is 140440587193.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 243933258816 + 147851785225 = 493896^2 + 384515^2 .

It is a cyclic number.

It is not a de Polignac number, because 391785044041 - 2³ = 391785044033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 391785043982 and 391785044000.

It is not a weakly prime, because it can be changed into another prime (391785044051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195892522020 + 195892522021.

It is an arithmetic number, because the mean of its divisors is an integer number (195892522021).

Almost surely, 2^391785044041 is an apocalyptic number.

It is an amenable number.

391785044041 is a deficient number, since it is larger than the sum of its proper divisors (1).

391785044041 is an equidigital number, since it uses as much as digits as its factorization.

391785044041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 483840, while the sum is 46.

The spelling of 391785044041 in words is "three hundred ninety-one billion, seven hundred eighty-five million, forty-four thousand, forty-one".