82665391 has 2 divisors, whose sum is σ = 82665392. Its totient is φ = 82665390.

The previous prime is 82665377. The next prime is 82665397. The reversal of 82665391 is 19356628.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 82665391 - 2¹³ = 82657199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82665397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41332695 + 41332696.

It is an arithmetic number, because the mean of its divisors is an integer number (41332696).

Almost surely, 2^82665391 is an apocalyptic number.

82665391 is a deficient number, since it is larger than the sum of its proper divisors (1).

82665391 is an equidigital number, since it uses as much as digits as its factorization.

82665391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 40.

The square root of 82665391 is about 9092.0509787396. The cubic root of 82665391 is about 435.6200976993.

The spelling of 82665391 in words is "eighty-two million, six hundred sixty-five thousand, three hundred ninety-one".