82591709 has 2 divisors, whose sum is σ = 82591710. Its totient is φ = 82591708.

The previous prime is 82591703. The next prime is 82591711. The reversal of 82591709 is 90719528.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56100100 + 26491609 = 7490^2 + 5147^2 .

It is a cyclic number.

It is not a de Polignac number, because 82591709 - 2⁴ = 82591693 is a prime.

Together with 82591711, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82591703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41295854 + 41295855.

It is an arithmetic number, because the mean of its divisors is an integer number (41295855).

Almost surely, 2^82591709 is an apocalyptic number.

It is an amenable number.

82591709 is a deficient number, since it is larger than the sum of its proper divisors (1).

82591709 is an equidigital number, since it uses as much as digits as its factorization.

82591709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 82591709 is about 9087.9980743836. The cubic root of 82591709 is about 435.4906323902.

The spelling of 82591709 in words is "eighty-two million, five hundred ninety-one thousand, seven hundred nine".