84216481 has 2 divisors, whose sum is σ = 84216482. Its totient is φ = 84216480.

The previous prime is 84216469. The next prime is 84216497. The reversal of 84216481 is 18461248.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78499600 + 5716881 = 8860^2 + 2391^2 .

It is a cyclic number.

It is not a de Polignac number, because 84216481 - 2⁹ = 84215969 is a prime.

It is a super-2 number, since 2×84216481² = 14184831344046722, which contains 22 as substring.

It is equal to p_4900867 and since 84216481 and 4900867 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (84216281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42108240 + 42108241.

It is an arithmetic number, because the mean of its divisors is an integer number (42108241).

Almost surely, 2^84216481 is an apocalyptic number.

It is an amenable number.

84216481 is a deficient number, since it is larger than the sum of its proper divisors (1).

84216481 is an equidigital number, since it uses as much as digits as its factorization.

84216481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12288, while the sum is 34.

The square root of 84216481 is about 9176.9537974210. The cubic root of 84216481 is about 438.3278145424.

The spelling of 84216481 in words is "eighty-four million, two hundred sixteen thousand, four hundred eighty-one".