81214411 has 2 divisors, whose sum is σ = 81214412. Its totient is φ = 81214410.

The previous prime is 81214381. The next prime is 81214433. The reversal of 81214411 is 11441218.

It is an a-pointer prime, because the next prime (81214433) can be obtained adding 81214411 to its sum of digits (22).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81214411 - 2⁷ = 81214283 is a prime.

It is not a weakly prime, because it can be changed into another prime (81214711) 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, 40607205 + 40607206.

It is an arithmetic number, because the mean of its divisors is an integer number (40607206).

Almost surely, 2^81214411 is an apocalyptic number.

81214411 is a deficient number, since it is larger than the sum of its proper divisors (1).

81214411 is an equidigital number, since it uses as much as digits as its factorization.

81214411 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 256, while the sum is 22.

The square root of 81214411 is about 9011.9038499087. The cubic root of 81214411 is about 433.0563053150.

Adding to 81214411 its reverse (11441218), we get a palindrome (92655629).

The spelling of 81214411 in words is "eighty-one million, two hundred fourteen thousand, four hundred eleven".