81095281049 has 4 divisors (see below), whose sum is σ = 81096034560. Its totient is φ = 81094527540.

The previous prime is 81095281039. The next prime is 81095281073. The reversal of 81095281049 is 94018259018.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 81095281049 - 2⁸ = 81095280793 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81095280994 and 81095281012.

It is not an unprimeable number, because it can be changed into a prime (81095281039) 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 in 3 ways as a sum of consecutive naturals, for example, 181637 + ... + 441794.

It is an arithmetic number, because the mean of its divisors is an integer number (20274008640).

Almost surely, 2^81095281049 is an apocalyptic number.

It is an amenable number.

81095281049 is a deficient number, since it is larger than the sum of its proper divisors (753511).

81095281049 is a wasteful number, since it uses less digits than its factorization.

81095281049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753510.

The product of its (nonzero) digits is 207360, while the sum is 47.

The spelling of 81095281049 in words is "eighty-one billion, ninety-five million, two hundred eighty-one thousand, forty-nine".