82409869 has 2 divisors, whose sum is σ = 82409870. Its totient is φ = 82409868.

The previous prime is 82409867. The next prime is 82409879. The reversal of 82409869 is 96890428.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54213769 + 28196100 = 7363^2 + 5310^2 .

It is a cyclic number.

It is not a de Polignac number, because 82409869 - 2¹ = 82409867 is a prime.

It is a super-2 number, since 2×82409869² = 13582773017194322, which contains 22 as substring.

Together with 82409867, 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 (82409861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41204934 + 41204935.

It is an arithmetic number, because the mean of its divisors is an integer number (41204935).

Almost surely, 2^82409869 is an apocalyptic number.

It is an amenable number.

82409869 is a deficient number, since it is larger than the sum of its proper divisors (1).

82409869 is an equidigital number, since it uses as much as digits as its factorization.

82409869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 82409869 is about 9077.9881581769. The cubic root of 82409869 is about 435.1707947806.

The spelling of 82409869 in words is "eighty-two million, four hundred nine thousand, eight hundred sixty-nine".