82790009 has 2 divisors, whose sum is σ = 82790010. Its totient is φ = 82790008.

The previous prime is 82789997. The next prime is 82790021. The reversal of 82790009 is 90009728.

It is a balanced prime because it is at equal distance from previous prime (82789997) and next prime (82790021).

It can be written as a sum of positive squares in only one way, i.e., 57760000 + 25030009 = 7600^2 + 5003^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82790009 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (82790089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41395004 + 41395005.

It is an arithmetic number, because the mean of its divisors is an integer number (41395005).

Almost surely, 2^82790009 is an apocalyptic number.

It is an amenable number.

82790009 is a deficient number, since it is larger than the sum of its proper divisors (1).

82790009 is an equidigital number, since it uses as much as digits as its factorization.

82790009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 82790009 is about 9098.9015271075. The cubic root of 82790009 is about 435.8388867586.

The spelling of 82790009 in words is "eighty-two million, seven hundred ninety thousand, nine".