84509617 has 2 divisors, whose sum is σ = 84509618. Its totient is φ = 84509616.

The previous prime is 84509611. The next prime is 84509647. The reversal of 84509617 is 71690548.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61842496 + 22667121 = 7864^2 + 4761^2 .

It is a cyclic number.

It is not a de Polignac number, because 84509617 - 2²³ = 76121009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 84509617.

It is not a weakly prime, because it can be changed into another prime (84509611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42254808 + 42254809.

It is an arithmetic number, because the mean of its divisors is an integer number (42254809).

Almost surely, 2^84509617 is an apocalyptic number.

It is an amenable number.

84509617 is a deficient number, since it is larger than the sum of its proper divisors (1).

84509617 is an equidigital number, since it uses as much as digits as its factorization.

84509617 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 84509617 is about 9192.9112363821. The cubic root of 84509617 is about 438.8357945659.

The spelling of 84509617 in words is "eighty-four million, five hundred nine thousand, six hundred seventeen".