81404310451 has 2 divisors, whose sum is σ = 81404310452. Its totient is φ = 81404310450.

The previous prime is 81404310443. The next prime is 81404310497. The reversal of 81404310451 is 15401340418.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81404310451 - 2³ = 81404310443 is a prime.

It is not a weakly prime, because it can be changed into another 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 as a sum of consecutive naturals, namely, 40702155225 + 40702155226.

It is an arithmetic number, because the mean of its divisors is an integer number (40702155226).

Almost surely, 2^81404310451 is an apocalyptic number.

81404310451 is a deficient number, since it is larger than the sum of its proper divisors (1).

81404310451 is an equidigital number, since it uses as much as digits as its factorization.

81404310451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7680, while the sum is 31.

Adding to 81404310451 its reverse (15401340418), we get a palindrome (96805650869).

The spelling of 81404310451 in words is "eighty-one billion, four hundred four million, three hundred ten thousand, four hundred fifty-one".