84918561 has 32 divisors (see below), whose sum is σ = 142007040. Its totient is φ = 43939584.

The previous prime is 84918551. The next prime is 84918629. The reversal of 84918561 is 16581948.

It is not a de Polignac number, because 84918561 - 2⁵ = 84918529 is a prime.

It is a super-2 number, since 2×84918561² = 14422324004621442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (84918511) 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 31 ways as a sum of consecutive naturals, for example, 11535 + ... + 17403.

It is an arithmetic number, because the mean of its divisors is an integer number (4437720).

Almost surely, 2^84918561 is an apocalyptic number.

It is an amenable number.

84918561 is a deficient number, since it is larger than the sum of its proper divisors (57088479).

84918561 is a wasteful number, since it uses less digits than its factorization.

84918561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5945.

The product of its digits is 69120, while the sum is 42.

The square root of 84918561 is about 9215.1267489927. The cubic root of 84918561 is about 439.5425014001.

The spelling of 84918561 in words is "eighty-four million, nine hundred eighteen thousand, five hundred sixty-one".