82987909 has 2 divisors, whose sum is σ = 82987910. Its totient is φ = 82987908.

The previous prime is 82987907. The next prime is 82987921. The reversal of 82987909 is 90978928.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55130625 + 27857284 = 7425^2 + 5278^2 .

It is a cyclic number.

It is not a de Polignac number, because 82987909 - 2¹ = 82987907 is a prime.

Together with 82987907, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82987903) 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, 41493954 + 41493955.

It is an arithmetic number, because the mean of its divisors is an integer number (41493955).

Almost surely, 2^82987909 is an apocalyptic number.

It is an amenable number.

82987909 is a deficient number, since it is larger than the sum of its proper divisors (1).

82987909 is an equidigital number, since it uses as much as digits as its factorization.

82987909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 52.

The square root of 82987909 is about 9109.7699751421. The cubic root of 82987909 is about 436.1858846725.

The spelling of 82987909 in words is "eighty-two million, nine hundred eighty-seven thousand, nine hundred nine".