81104006831 has 2 divisors, whose sum is σ = 81104006832. Its totient is φ = 81104006830.

The previous prime is 81104006807. The next prime is 81104006843. The reversal of 81104006831 is 13860040118.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81104006831 is a prime.

It is a super-2 number, since 2×81104006831² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81104006891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40552003415 + 40552003416.

It is an arithmetic number, because the mean of its divisors is an integer number (40552003416).

Almost surely, 2^81104006831 is an apocalyptic number.

81104006831 is a deficient number, since it is larger than the sum of its proper divisors (1).

81104006831 is an equidigital number, since it uses as much as digits as its factorization.

81104006831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 32.

Adding to 81104006831 its reverse (13860040118), we get a palindrome (94964046949).

The spelling of 81104006831 in words is "eighty-one billion, one hundred four million, six thousand, eight hundred thirty-one".