81090831075 has 48 divisors (see below), whose sum is σ = 135027357696. Its totient is φ = 42940547200.

The previous prime is 81090831067. The next prime is 81090831103. The reversal of 81090831075 is 57013809018.

It is not a de Polignac number, because 81090831075 - 2³ = 81090831067 is a prime.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 7973944 + ... + 7984106.

It is an arithmetic number, because the mean of its divisors is an integer number (2813069952).

Almost surely, 2^81090831075 is an apocalyptic number.

81090831075 is a deficient number, since it is larger than the sum of its proper divisors (53936526621).

81090831075 is a wasteful number, since it uses less digits than its factorization.

81090831075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10924 (or 10919 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 42.

The spelling of 81090831075 in words is "eighty-one billion, ninety million, eight hundred thirty-one thousand, seventy-five".