82490809 has 2 divisors, whose sum is σ = 82490810. Its totient is φ = 82490808.

The previous prime is 82490789. The next prime is 82490833. The reversal of 82490809 is 90809428.

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., 64850809 + 17640000 = 8053^2 + 4200^2 .

It is a cyclic number.

It is not a de Polignac number, because 82490809 - 2⁵ = 82490777 is a prime.

It is not a weakly prime, because it can be changed into another prime (82490839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41245404 + 41245405.

It is an arithmetic number, because the mean of its divisors is an integer number (41245405).

Almost surely, 2^82490809 is an apocalyptic number.

It is an amenable number.

82490809 is a deficient number, since it is larger than the sum of its proper divisors (1).

82490809 is an equidigital number, since it uses as much as digits as its factorization.

82490809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 82490809 is about 9082.4451003020. The cubic root of 82490809 is about 435.3132178477.

The spelling of 82490809 in words is "eighty-two million, four hundred ninety thousand, eight hundred nine".