82142789 has 2 divisors, whose sum is σ = 82142790. Its totient is φ = 82142788.

The previous prime is 82142779. The next prime is 82142813. The reversal of 82142789 is 98724128.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78021889 + 4120900 = 8833^2 + 2030^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82142789 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82142779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41071394 + 41071395.

It is an arithmetic number, because the mean of its divisors is an integer number (41071395).

Almost surely, 2^82142789 is an apocalyptic number.

It is an amenable number.

82142789 is a deficient number, since it is larger than the sum of its proper divisors (1).

82142789 is an equidigital number, since it uses as much as digits as its factorization.

82142789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 41.

The square root of 82142789 is about 9063.2659124622. The cubic root of 82142789 is about 434.7001747721.

The spelling of 82142789 in words is "eighty-two million, one hundred forty-two thousand, seven hundred eighty-nine".