82077691 has 2 divisors, whose sum is σ = 82077692. Its totient is φ = 82077690.

The previous prime is 82077679. The next prime is 82077707. The reversal of 82077691 is 19677028.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 82077691 - 2⁷ = 82077563 is a prime.

It is not a weakly prime, because it can be changed into another prime (82077631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41038845 + 41038846.

It is an arithmetic number, because the mean of its divisors is an integer number (41038846).

Almost surely, 2^82077691 is an apocalyptic number.

82077691 is a deficient number, since it is larger than the sum of its proper divisors (1).

82077691 is an equidigital number, since it uses as much as digits as its factorization.

82077691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 82077691 is about 9059.6738903782. The cubic root of 82077691 is about 434.5853114103.

The spelling of 82077691 in words is "eighty-two million, seventy-seven thousand, six hundred ninety-one".