82119409 has 2 divisors, whose sum is σ = 82119410. Its totient is φ = 82119408.

The previous prime is 82119251. The next prime is 82119431. The reversal of 82119409 is 90491128.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72335025 + 9784384 = 8505^2 + 3128^2 .

It is a cyclic number.

It is not a de Polignac number, because 82119409 - 2²⁵ = 48564977 is a prime.

It is not a weakly prime, because it can be changed into another prime (82119109) 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, 41059704 + 41059705.

It is an arithmetic number, because the mean of its divisors is an integer number (41059705).

Almost surely, 2^82119409 is an apocalyptic number.

It is an amenable number.

82119409 is a deficient number, since it is larger than the sum of its proper divisors (1).

82119409 is an equidigital number, since it uses as much as digits as its factorization.

82119409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 82119409 is about 9061.9759986440. The cubic root of 82119409 is about 434.6589284878.

It can be divided in two parts, 82119 and 409, that added together give a palindrome (82528).

The spelling of 82119409 in words is "eighty-two million, one hundred nineteen thousand, four hundred nine".