85217647 has 2 divisors, whose sum is σ = 85217648. Its totient is φ = 85217646.

The previous prime is 85217621. The next prime is 85217659. The reversal of 85217647 is 74671258.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85217647 - 2⁷ = 85217519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85217687) 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, 42608823 + 42608824.

It is an arithmetic number, because the mean of its divisors is an integer number (42608824).

Almost surely, 2^85217647 is an apocalyptic number.

85217647 is a deficient number, since it is larger than the sum of its proper divisors (1).

85217647 is an equidigital number, since it uses as much as digits as its factorization.

85217647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94080, while the sum is 40.

The square root of 85217647 is about 9231.3404768755. The cubic root of 85217647 is about 440.0579245366.

The spelling of 85217647 in words is "eighty-five million, two hundred seventeen thousand, six hundred forty-seven".