82143661 has 2 divisors, whose sum is σ = 82143662. Its totient is φ = 82143660.

The previous prime is 82143641. The next prime is 82143671. The reversal of 82143661 is 16634128.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70241161 + 11902500 = 8381^2 + 3450^2 .

It is a cyclic number.

It is not a de Polignac number, because 82143661 - 2⁷ = 82143533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82143641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41071830 + 41071831.

It is an arithmetic number, because the mean of its divisors is an integer number (41071831).

Almost surely, 2^82143661 is an apocalyptic number.

It is an amenable number.

82143661 is a deficient number, since it is larger than the sum of its proper divisors (1).

82143661 is an equidigital number, since it uses as much as digits as its factorization.

82143661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 31.

The square root of 82143661 is about 9063.3140186137. The cubic root of 82143661 is about 434.7017129766.

Adding to 82143661 its reverse (16634128), we get a palindrome (98777789).

The spelling of 82143661 in words is "eighty-two million, one hundred forty-three thousand, six hundred sixty-one".