84980209 has 2 divisors, whose sum is σ = 84980210. Its totient is φ = 84980208.

The previous prime is 84980197. The next prime is 84980219. The reversal of 84980209 is 90208948.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54066609 + 30913600 = 7353^2 + 5560^2 .

It is a cyclic number.

It is not a de Polignac number, because 84980209 - 2⁵ = 84980177 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84980219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42490104 + 42490105.

It is an arithmetic number, because the mean of its divisors is an integer number (42490105).

Almost surely, 2^84980209 is an apocalyptic number.

It is an amenable number.

84980209 is a deficient number, since it is larger than the sum of its proper divisors (1).

84980209 is an equidigital number, since it uses as much as digits as its factorization.

84980209 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 84980209 is about 9218.4710771364. The cubic root of 84980209 is about 439.6488399960.

The spelling of 84980209 in words is "eighty-four million, nine hundred eighty thousand, two hundred nine".