81804310871 has 4 divisors (see below), whose sum is σ = 82062368952. Its totient is φ = 81546252792.

The previous prime is 81804310859. The next prime is 81804310883. The reversal of 81804310871 is 17801340818.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (81804310859) and next prime (81804310883).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81804310871 is a prime.

It is a super-3 number, since 3×81804310871³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81804310801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129028565 + ... + 129029198.

It is an arithmetic number, because the mean of its divisors is an integer number (20515592238).

Almost surely, 2^81804310871 is an apocalyptic number.

81804310871 is a deficient number, since it is larger than the sum of its proper divisors (258058081).

81804310871 is a wasteful number, since it uses less digits than its factorization.

81804310871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258058080.

The product of its (nonzero) digits is 43008, while the sum is 41.

The spelling of 81804310871 in words is "eighty-one billion, eight hundred four million, three hundred ten thousand, eight hundred seventy-one".