82681589 has 2 divisors, whose sum is σ = 82681590. Its totient is φ = 82681588.

The previous prime is 82681583. The next prime is 82681607. The reversal of 82681589 is 98518628.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54272689 + 28408900 = 7367^2 + 5330^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82681589 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82681583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41340794 + 41340795.

It is an arithmetic number, because the mean of its divisors is an integer number (41340795).

Almost surely, 2^82681589 is an apocalyptic number.

It is an amenable number.

82681589 is a deficient number, since it is larger than the sum of its proper divisors (1).

82681589 is an equidigital number, since it uses as much as digits as its factorization.

82681589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 276480, while the sum is 47.

The square root of 82681589 is about 9092.9417132191. The cubic root of 82681589 is about 435.6485485961.

The spelling of 82681589 in words is "eighty-two million, six hundred eighty-one thousand, five hundred eighty-nine".