7981311590191 has 2 divisors, whose sum is σ = 7981311590192. Its totient is φ = 7981311590190.

The previous prime is 7981311590143. The next prime is 7981311590237. The reversal of 7981311590191 is 1910951131897.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7981311590191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7981311590141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3990655795095 + 3990655795096.

It is an arithmetic number, because the mean of its divisors is an integer number (3990655795096).

Almost surely, 2^{7981311590191} is an apocalyptic number.

7981311590191 is a deficient number, since it is larger than the sum of its proper divisors (1).

7981311590191 is an equidigital number, since it uses as much as digits as its factorization.

7981311590191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 612360, while the sum is 55.

The spelling of 7981311590191 in words is "seven trillion, nine hundred eighty-one billion, three hundred eleven million, five hundred ninety thousand, one hundred ninety-one".