81394284007 has 2 divisors, whose sum is σ = 81394284008. Its totient is φ = 81394284006.

The previous prime is 81394283989. The next prime is 81394284029. The reversal of 81394284007 is 70048249318.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81394284007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81394284067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40697142003 + 40697142004.

It is an arithmetic number, because the mean of its divisors is an integer number (40697142004).

Almost surely, 2^81394284007 is an apocalyptic number.

81394284007 is a deficient number, since it is larger than the sum of its proper divisors (1).

81394284007 is an equidigital number, since it uses as much as digits as its factorization.

81394284007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 387072, while the sum is 46.

The spelling of 81394284007 in words is "eighty-one billion, three hundred ninety-four million, two hundred eighty-four thousand, seven".