82215311 has 2 divisors, whose sum is σ = 82215312. Its totient is φ = 82215310.

The previous prime is 82215257. The next prime is 82215323. The reversal of 82215311 is 11351228.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82215311 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82205311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41107655 + 41107656.

It is an arithmetic number, because the mean of its divisors is an integer number (41107656).

Almost surely, 2^82215311 is an apocalyptic number.

82215311 is a deficient number, since it is larger than the sum of its proper divisors (1).

82215311 is an equidigital number, since it uses as much as digits as its factorization.

82215311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 480, while the sum is 23.

The square root of 82215311 is about 9067.2659054425. The cubic root of 82215311 is about 434.8280661076.

Adding to 82215311 its reverse (11351228), we get a palindrome (93566539).

The spelling of 82215311 in words is "eighty-two million, two hundred fifteen thousand, three hundred eleven".