81335339 has 2 divisors, whose sum is σ = 81335340. Its totient is φ = 81335338.

The previous prime is 81335329. The next prime is 81335341. The reversal of 81335339 is 93353318.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81335339 is a prime.

Together with 81335341, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 81335299 and 81335308.

It is not a weakly prime, because it can be changed into another prime (81335329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40667669 + 40667670.

It is an arithmetic number, because the mean of its divisors is an integer number (40667670).

Almost surely, 2^81335339 is an apocalyptic number.

81335339 is a deficient number, since it is larger than the sum of its proper divisors (1).

81335339 is an equidigital number, since it uses as much as digits as its factorization.

81335339 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29160, while the sum is 35.

The square root of 81335339 is about 9018.6107023200. The cubic root of 81335339 is about 433.2711385426.

The spelling of 81335339 in words is "eighty-one million, three hundred thirty-five thousand, three hundred thirty-nine".