84817289 has 2 divisors, whose sum is σ = 84817290. Its totient is φ = 84817288.

The previous prime is 84817259. The next prime is 84817303. The reversal of 84817289 is 98271848.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84732025 + 85264 = 9205^2 + 292^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84817289 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (84817259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42408644 + 42408645.

It is an arithmetic number, because the mean of its divisors is an integer number (42408645).

Almost surely, 2^84817289 is an apocalyptic number.

It is an amenable number.

84817289 is a deficient number, since it is larger than the sum of its proper divisors (1).

84817289 is an equidigital number, since it uses as much as digits as its factorization.

84817289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 258048, while the sum is 47.

The square root of 84817289 is about 9209.6302314479. The cubic root of 84817289 is about 439.3677023353.

The spelling of 84817289 in words is "eighty-four million, eight hundred seventeen thousand, two hundred eighty-nine".