82109851 has 2 divisors, whose sum is σ = 82109852. Its totient is φ = 82109850.

The previous prime is 82109837. The next prime is 82109857. The reversal of 82109851 is 15890128.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 82109851 - 2¹³ = 82101659 is a prime.

It is not a weakly prime, because it can be changed into another prime (82109857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41054925 + 41054926.

It is an arithmetic number, because the mean of its divisors is an integer number (41054926).

Almost surely, 2^82109851 is an apocalyptic number.

82109851 is a deficient number, since it is larger than the sum of its proper divisors (1).

82109851 is an equidigital number, since it uses as much as digits as its factorization.

82109851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 82109851 is about 9061.4486148739. The cubic root of 82109851 is about 434.6420643007.

Adding to 82109851 its reverse (15890128), we get a palindrome (97999979).

The spelling of 82109851 in words is "eighty-two million, one hundred nine thousand, eight hundred fifty-one".