82689391 has 2 divisors, whose sum is σ = 82689392. Its totient is φ = 82689390.

The previous prime is 82689289. The next prime is 82689419. The reversal of 82689391 is 19398628.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 82689391 - 2²⁵ = 49134959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82689091) 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, 41344695 + 41344696.

It is an arithmetic number, because the mean of its divisors is an integer number (41344696).

Almost surely, 2^82689391 is an apocalyptic number.

82689391 is a deficient number, since it is larger than the sum of its proper divisors (1).

82689391 is an equidigital number, since it uses as much as digits as its factorization.

82689391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 46.

The square root of 82689391 is about 9093.3707171763. The cubic root of 82689391 is about 435.6622510543.

The spelling of 82689391 in words is "eighty-two million, six hundred eighty-nine thousand, three hundred ninety-one".