84684561 has 16 divisors (see below), whose sum is σ = 122808000. Its totient is φ = 51595200.

The previous prime is 84684541. The next prime is 84684569. The reversal of 84684561 is 16548648.

It is not a de Polignac number, because 84684561 - 2⁹ = 84684049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (84684569) 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 in 15 ways as a sum of consecutive naturals, for example, 6811 + ... + 14688.

It is an arithmetic number, because the mean of its divisors is an integer number (7675500).

Almost surely, 2^84684561 is an apocalyptic number.

It is an amenable number.

84684561 is a deficient number, since it is larger than the sum of its proper divisors (38123439).

84684561 is a wasteful number, since it uses less digits than its factorization.

84684561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21616.

The product of its digits is 184320, while the sum is 42.

The square root of 84684561 is about 9202.4214748076. The cubic root of 84684561 is about 439.1383982915.

The spelling of 84684561 in words is "eighty-four million, six hundred eighty-four thousand, five hundred sixty-one".