391192421863 has 2 divisors, whose sum is σ = 391192421864. Its totient is φ = 391192421862.

The previous prime is 391192421857. The next prime is 391192421909. The reversal of 391192421863 is 368124291193.

It is a weak prime.

It is an emirp because it is prime and its reverse (368124291193) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 391192421863 - 2²¹ = 391190324711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (391192421063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195596210931 + 195596210932.

It is an arithmetic number, because the mean of its divisors is an integer number (195596210932).

Almost surely, 2^391192421863 is an apocalyptic number.

391192421863 is a deficient number, since it is larger than the sum of its proper divisors (1).

391192421863 is an equidigital number, since it uses as much as digits as its factorization.

391192421863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 49.

The spelling of 391192421863 in words is "three hundred ninety-one billion, one hundred ninety-two million, four hundred twenty-one thousand, eight hundred sixty-three".