81089384339 has 2 divisors, whose sum is σ = 81089384340. Its totient is φ = 81089384338.

The previous prime is 81089384281. The next prime is 81089384347. The reversal of 81089384339 is 93348398018.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81089384339 - 2¹² = 81089380243 is a prime.

It is not a weakly prime, because it can be changed into another prime (81089384539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40544692169 + 40544692170.

It is an arithmetic number, because the mean of its divisors is an integer number (40544692170).

Almost surely, 2^81089384339 is an apocalyptic number.

81089384339 is a deficient number, since it is larger than the sum of its proper divisors (1).

81089384339 is an equidigital number, since it uses as much as digits as its factorization.

81089384339 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4478976, while the sum is 56.

The spelling of 81089384339 in words is "eighty-one billion, eighty-nine million, three hundred eighty-four thousand, three hundred thirty-nine".