82161791 has 2 divisors, whose sum is σ = 82161792. Its totient is φ = 82161790.

The previous prime is 82161763. The next prime is 82161797. The reversal of 82161791 is 19716128.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 82161791 - 2¹⁸ = 81899647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82161797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41080895 + 41080896.

It is an arithmetic number, because the mean of its divisors is an integer number (41080896).

Almost surely, 2^82161791 is an apocalyptic number.

82161791 is a deficient number, since it is larger than the sum of its proper divisors (1).

82161791 is an equidigital number, since it uses as much as digits as its factorization.

82161791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 35.

The square root of 82161791 is about 9064.3141494544. The cubic root of 82161791 is about 434.7336917570.

The spelling of 82161791 in words is "eighty-two million, one hundred sixty-one thousand, seven hundred ninety-one".