81340411 has 2 divisors, whose sum is σ = 81340412. Its totient is φ = 81340410.

The previous prime is 81340367. The next prime is 81340421. The reversal of 81340411 is 11404318.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81340411 - 2⁷ = 81340283 is a prime.

It is not a weakly prime, because it can be changed into another prime (81340421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40670205 + 40670206.

It is an arithmetic number, because the mean of its divisors is an integer number (40670206).

Almost surely, 2^81340411 is an apocalyptic number.

81340411 is a deficient number, since it is larger than the sum of its proper divisors (1).

81340411 is an equidigital number, since it uses as much as digits as its factorization.

81340411 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 81340411 is about 9018.8918942407. The cubic root of 81340411 is about 433.2801444907.

Adding to 81340411 its reverse (11404318), we get a palindrome (92744729).

The spelling of 81340411 in words is "eighty-one million, three hundred forty thousand, four hundred eleven".