391419116581 has 2 divisors, whose sum is σ = 391419116582. Its totient is φ = 391419116580.

The previous prime is 391419116563. The next prime is 391419116609. The reversal of 391419116581 is 185611914193.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 370229656225 + 21189460356 = 608465^2 + 145566^2 .

It is a cyclic number.

It is not a de Polignac number, because 391419116581 - 2²⁷ = 391284898853 is a prime.

It is a super-2 number, since 2×391419116581² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (391419116551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195709558290 + 195709558291.

It is an arithmetic number, because the mean of its divisors is an integer number (195709558291).

Almost surely, 2^391419116581 is an apocalyptic number.

It is an amenable number.

391419116581 is a deficient number, since it is larger than the sum of its proper divisors (1).

391419116581 is an equidigital number, since it uses as much as digits as its factorization.

391419116581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 49.

The spelling of 391419116581 in words is "three hundred ninety-one billion, four hundred nineteen million, one hundred sixteen thousand, five hundred eighty-one".