81130719911 has 2 divisors, whose sum is σ = 81130719912. Its totient is φ = 81130719910.

The previous prime is 81130719871. The next prime is 81130719919. The reversal of 81130719911 is 11991703118.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81130719911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81130719919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40565359955 + 40565359956.

It is an arithmetic number, because the mean of its divisors is an integer number (40565359956).

Almost surely, 2^81130719911 is an apocalyptic number.

81130719911 is a deficient number, since it is larger than the sum of its proper divisors (1).

81130719911 is an equidigital number, since it uses as much as digits as its factorization.

81130719911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 41.

The spelling of 81130719911 in words is "eighty-one billion, one hundred thirty million, seven hundred nineteen thousand, nine hundred eleven".