84404081 has 2 divisors, whose sum is σ = 84404082. Its totient is φ = 84404080.

The previous prime is 84404077. The next prime is 84404083. The reversal of 84404081 is 18040448.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77721856 + 6682225 = 8816^2 + 2585^2 .

It is a cyclic number.

It is not a de Polignac number, because 84404081 - 2² = 84404077 is a prime.

It is a super-2 number, since 2×84404081² = 14248097778909122, which contains 22 as substring.

Together with 84404083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84404083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42202040 + 42202041.

It is an arithmetic number, because the mean of its divisors is an integer number (42202041).

Almost surely, 2^84404081 is an apocalyptic number.

It is an amenable number.

84404081 is a deficient number, since it is larger than the sum of its proper divisors (1).

84404081 is an equidigital number, since it uses as much as digits as its factorization.

84404081 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 29.

The square root of 84404081 is about 9187.1693682004. The cubic root of 84404081 is about 438.6530450830.

It can be divided in two parts, 8440 and 4081, that added together give a palindrome (12521).

The spelling of 84404081 in words is "eighty-four million, four hundred four thousand, eighty-one".