81140714191 has 2 divisors, whose sum is σ = 81140714192. Its totient is φ = 81140714190.

The previous prime is 81140714143. The next prime is 81140714201. The reversal of 81140714191 is 19141704118.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81140714191 - 2¹⁵ = 81140681423 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81140714191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81140714491) 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, 40570357095 + 40570357096.

It is an arithmetic number, because the mean of its divisors is an integer number (40570357096).

Almost surely, 2^81140714191 is an apocalyptic number.

81140714191 is a deficient number, since it is larger than the sum of its proper divisors (1).

81140714191 is an equidigital number, since it uses as much as digits as its factorization.

81140714191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 37.

The spelling of 81140714191 in words is "eighty-one billion, one hundred forty million, seven hundred fourteen thousand, one hundred ninety-one".