84218081 has 2 divisors, whose sum is σ = 84218082. Its totient is φ = 84218080.

The previous prime is 84218039. The next prime is 84218093. The reversal of 84218081 is 18081248.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83905600 + 312481 = 9160^2 + 559^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84218081 is a prime.

It is a super-2 number, since 2×84218081² = 14185370334645122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84218021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42109040 + 42109041.

It is an arithmetic number, because the mean of its divisors is an integer number (42109041).

Almost surely, 2^84218081 is an apocalyptic number.

It is an amenable number.

84218081 is a deficient number, since it is larger than the sum of its proper divisors (1).

84218081 is an equidigital number, since it uses as much as digits as its factorization.

84218081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4096, while the sum is 32.

The square root of 84218081 is about 9177.0409719037. The cubic root of 84218081 is about 438.3305904047.

The spelling of 84218081 in words is "eighty-four million, two hundred eighteen thousand, eighty-one".