84660809 has 2 divisors, whose sum is σ = 84660810. Its totient is φ = 84660808.

The previous prime is 84660791. The next prime is 84660857. The reversal of 84660809 is 90806648.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78765625 + 5895184 = 8875^2 + 2428^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84660809 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84663809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42330404 + 42330405.

It is an arithmetic number, because the mean of its divisors is an integer number (42330405).

Almost surely, 2^84660809 is an apocalyptic number.

It is an amenable number.

84660809 is a deficient number, since it is larger than the sum of its proper divisors (1).

84660809 is an equidigital number, since it uses as much as digits as its factorization.

84660809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 84660809 is about 9201.1308544113. The cubic root of 84660809 is about 439.0973385028.

The spelling of 84660809 in words is "eighty-four million, six hundred sixty thousand, eight hundred nine".