181989404339 has 2 divisors, whose sum is σ = 181989404340. Its totient is φ = 181989404338.

The previous prime is 181989404327. The next prime is 181989404341. The reversal of 181989404339 is 933404989181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 181989404339 - 2⁸ = 181989404083 is a prime.

Together with 181989404341, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (181989404369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90994702169 + 90994702170.

It is an arithmetic number, because the mean of its divisors is an integer number (90994702170).

Almost surely, 2^181989404339 is an apocalyptic number.

181989404339 is a deficient number, since it is larger than the sum of its proper divisors (1).

181989404339 is an equidigital number, since it uses as much as digits as its factorization.

181989404339 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6718464, while the sum is 59.

The spelling of 181989404339 in words is "one hundred eighty-one billion, nine hundred eighty-nine million, four hundred four thousand, three hundred thirty-nine".