82191913 has 2 divisors, whose sum is σ = 82191914. Its totient is φ = 82191912.

The previous prime is 82191871. The next prime is 82191947. The reversal of 82191913 is 31919128.

It is an a-pointer prime, because the next prime (82191947) can be obtained adding 82191913 to its sum of digits (34).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73822464 + 8369449 = 8592^2 + 2893^2 .

It is a cyclic number.

It is not a de Polignac number, because 82191913 - 2⁹ = 82191401 is a prime.

It is not a weakly prime, because it can be changed into another prime (82191113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41095956 + 41095957.

It is an arithmetic number, because the mean of its divisors is an integer number (41095957).

Almost surely, 2^82191913 is an apocalyptic number.

It is an amenable number.

82191913 is a deficient number, since it is larger than the sum of its proper divisors (1).

82191913 is an equidigital number, since it uses as much as digits as its factorization.

82191913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 34.

The square root of 82191913 is about 9065.9755680236. The cubic root of 82191913 is about 434.7868123465.

The spelling of 82191913 in words is "eighty-two million, one hundred ninety-one thousand, nine hundred thirteen".