84165709 has 2 divisors, whose sum is σ = 84165710. Its totient is φ = 84165708.

The previous prime is 84165703. The next prime is 84165721. The reversal of 84165709 is 90756148.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82410084 + 1755625 = 9078^2 + 1325^2 .

It is a cyclic number.

It is not a de Polignac number, because 84165709 - 2⁷ = 84165581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84165703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42082854 + 42082855.

It is an arithmetic number, because the mean of its divisors is an integer number (42082855).

Almost surely, 2^84165709 is an apocalyptic number.

It is an amenable number.

84165709 is a deficient number, since it is larger than the sum of its proper divisors (1).

84165709 is an equidigital number, since it uses as much as digits as its factorization.

84165709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 84165709 is about 9174.1871029536. The cubic root of 84165709 is about 438.2397112269.

The spelling of 84165709 in words is "eighty-four million, one hundred sixty-five thousand, seven hundred nine".