81271794297 has 16 divisors (see below), whose sum is σ = 111347812800. Its totient is φ = 52689978432.

The previous prime is 81271794287. The next prime is 81271794319. The reversal of 81271794297 is 79249717218.

It is not a de Polignac number, because 81271794297 - 2⁴ = 81271794281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81271794287) 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 15 ways as a sum of consecutive naturals, for example, 33454 + ... + 404552.

It is an arithmetic number, because the mean of its divisors is an integer number (6959238300).

Almost surely, 2^81271794297 is an apocalyptic number.

It is an amenable number.

81271794297 is a deficient number, since it is larger than the sum of its proper divisors (30076018503).

81271794297 is a wasteful number, since it uses less digits than its factorization.

81271794297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373112.

The product of its digits is 3556224, while the sum is 57.

The spelling of 81271794297 in words is "eighty-one billion, two hundred seventy-one million, seven hundred ninety-four thousand, two hundred ninety-seven".