82087813 has 2 divisors, whose sum is σ = 82087814. Its totient is φ = 82087812.

The previous prime is 82087799. The next prime is 82087871. The reversal of 82087813 is 31878028.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82029249 + 58564 = 9057^2 + 242^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82087813 is a prime.

It is a congruent number.

It is a weakly prime.

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, 41043906 + 41043907.

It is an arithmetic number, because the mean of its divisors is an integer number (41043907).

Almost surely, 2^82087813 is an apocalyptic number.

It is an amenable number.

82087813 is a deficient number, since it is larger than the sum of its proper divisors (1).

82087813 is an equidigital number, since it uses as much as digits as its factorization.

82087813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 82087813 is about 9060.2325025355. The cubic root of 82087813 is about 434.6031753457.

The spelling of 82087813 in words is "eighty-two million, eighty-seven thousand, eight hundred thirteen".