82502809 has 2 divisors, whose sum is σ = 82502810. Its totient is φ = 82502808.

The previous prime is 82502789. The next prime is 82502831. The reversal of 82502809 is 90820528.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66781584 + 15721225 = 8172^2 + 3965^2 .

It is a cyclic number.

It is not a de Polignac number, because 82502809 - 2⁹ = 82502297 is a prime.

It is not a weakly prime, because it can be changed into another prime (82502839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41251404 + 41251405.

It is an arithmetic number, because the mean of its divisors is an integer number (41251405).

Almost surely, 2^82502809 is an apocalyptic number.

It is an amenable number.

82502809 is a deficient number, since it is larger than the sum of its proper divisors (1).

82502809 is an equidigital number, since it uses as much as digits as its factorization.

82502809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 82502809 is about 9083.1056913371. The cubic root of 82502809 is about 435.3343252713.

The spelling of 82502809 in words is "eighty-two million, five hundred two thousand, eight hundred nine".