82199869 has 2 divisors, whose sum is σ = 82199870. Its totient is φ = 82199868.

The previous prime is 82199867. The next prime is 82199893. The reversal of 82199869 is 96899128.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70728100 + 11471769 = 8410^2 + 3387^2 .

It is a cyclic number.

It is not a de Polignac number, because 82199869 - 2¹ = 82199867 is a prime.

It is a super-2 number, since 2×82199869² = 13513636927234322, which contains 22 as substring.

Together with 82199867, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82199867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41099934 + 41099935.

It is an arithmetic number, because the mean of its divisors is an integer number (41099935).

Almost surely, 2^82199869 is an apocalyptic number.

It is an amenable number.

82199869 is a deficient number, since it is larger than the sum of its proper divisors (1).

82199869 is an equidigital number, since it uses as much as digits as its factorization.

82199869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 52.

The square root of 82199869 is about 9066.4143408516. The cubic root of 82199869 is about 434.8008407026.

The spelling of 82199869 in words is "eighty-two million, one hundred ninety-nine thousand, eight hundred sixty-nine".