84908189 has 2 divisors, whose sum is σ = 84908190. Its totient is φ = 84908188.

The previous prime is 84908147. The next prime is 84908191. The reversal of 84908189 is 98180948.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68343289 + 16564900 = 8267^2 + 4070^2 .

It is a cyclic number.

It is not a de Polignac number, because 84908189 - 2¹² = 84904093 is a prime.

It is a Sophie Germain prime.

Together with 84908191, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84901189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42454094 + 42454095.

It is an arithmetic number, because the mean of its divisors is an integer number (42454095).

Almost surely, 2^84908189 is an apocalyptic number.

It is an amenable number.

84908189 is a deficient number, since it is larger than the sum of its proper divisors (1).

84908189 is an equidigital number, since it uses as much as digits as its factorization.

84908189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 47.

The square root of 84908189 is about 9214.5639614688. The cubic root of 84908189 is about 439.5246053501.

The spelling of 84908189 in words is "eighty-four million, nine hundred eight thousand, one hundred eighty-nine".