81386272871 has 8 divisors (see below), whose sum is σ = 84018789504. Its totient is φ = 78754203360.

The previous prime is 81386272841. The next prime is 81386272901. The reversal of 81386272871 is 17827268318.

It is an interprime number because it is at equal distance from previous prime (81386272841) and next prime (81386272901).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81386272871 - 2¹⁰ = 81386271847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81386272801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 280001 + ... + 491093.

It is an arithmetic number, because the mean of its divisors is an integer number (10502348688).

Almost surely, 2^81386272871 is an apocalyptic number.

81386272871 is a deficient number, since it is larger than the sum of its proper divisors (2632516633).

81386272871 is a wasteful number, since it uses less digits than its factorization.

81386272871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223561.

The product of its digits is 1806336, while the sum is 53.

The spelling of 81386272871 in words is "eighty-one billion, three hundred eighty-six million, two hundred seventy-two thousand, eight hundred seventy-one".