84065609 has 2 divisors, whose sum is σ = 84065610. Its totient is φ = 84065608.

The previous prime is 84065593. The next prime is 84065659. The reversal of 84065609 is 90656048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62647225 + 21418384 = 7915^2 + 4628^2 .

It is a cyclic number.

It is not a de Polignac number, because 84065609 - 2⁴ = 84065593 is a prime.

It is not a weakly prime, because it can be changed into another prime (84065659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42032804 + 42032805.

It is an arithmetic number, because the mean of its divisors is an integer number (42032805).

Almost surely, 2^84065609 is an apocalyptic number.

It is an amenable number.

84065609 is a deficient number, since it is larger than the sum of its proper divisors (1).

84065609 is an equidigital number, since it uses as much as digits as its factorization.

84065609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 84065609 is about 9168.7299556700. The cubic root of 84065609 is about 438.0659064868.

The spelling of 84065609 in words is "eighty-four million, sixty-five thousand, six hundred nine".