84605281 has 2 divisors, whose sum is σ = 84605282. Its totient is φ = 84605280.

The previous prime is 84605249. The next prime is 84605317. The reversal of 84605281 is 18250648.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66830625 + 17774656 = 8175^2 + 4216^2 .

It is a cyclic number.

It is not a de Polignac number, because 84605281 - 2⁵ = 84605249 is a prime.

It is a super-2 number, since 2×84605281² = 14316107146177922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (84605681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42302640 + 42302641.

It is an arithmetic number, because the mean of its divisors is an integer number (42302641).

Almost surely, 2^84605281 is an apocalyptic number.

It is an amenable number.

84605281 is a deficient number, since it is larger than the sum of its proper divisors (1).

84605281 is an equidigital number, since it uses as much as digits as its factorization.

84605281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 84605281 is about 9198.1129042864. The cubic root of 84605281 is about 439.0013179635.

The spelling of 84605281 in words is "eighty-four million, six hundred five thousand, two hundred eighty-one".