81404310471 has 16 divisors (see below), whose sum is σ = 118411120128. Its totient is φ = 49333924800.

The previous prime is 81404310451. The next prime is 81404310497. The reversal of 81404310471 is 17401340418.

It is not a de Polignac number, because 81404310471 - 2¹³ = 81404302279 is a prime.

It is a super-3 number, since 3×81404310471³ (a number of 34 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81404310401) 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, 1331586 + ... + 1391376.

It is an arithmetic number, because the mean of its divisors is an integer number (7400695008).

Almost surely, 2^81404310471 is an apocalyptic number.

81404310471 is a deficient number, since it is larger than the sum of its proper divisors (37006809657).

81404310471 is a wasteful number, since it uses less digits than its factorization.

81404310471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101062.

The product of its (nonzero) digits is 10752, while the sum is 33.

Adding to 81404310471 its reverse (17401340418), we get a palindrome (98805650889).

The spelling of 81404310471 in words is "eighty-one billion, four hundred four million, three hundred ten thousand, four hundred seventy-one".