82590509 has 2 divisors, whose sum is σ = 82590510. Its totient is φ = 82590508.

The previous prime is 82590491. The next prime is 82590577. The reversal of 82590509 is 90509528.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46854025 + 35736484 = 6845^2 + 5978^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82590509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82592509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41295254 + 41295255.

It is an arithmetic number, because the mean of its divisors is an integer number (41295255).

Almost surely, 2^82590509 is an apocalyptic number.

It is an amenable number.

82590509 is a deficient number, since it is larger than the sum of its proper divisors (1).

82590509 is an equidigital number, since it uses as much as digits as its factorization.

82590509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 82590509 is about 9087.9320530030. The cubic root of 82590509 is about 435.4885232548.

The spelling of 82590509 in words is "eighty-two million, five hundred ninety thousand, five hundred nine".