85859591 has 2 divisors, whose sum is σ = 85859592. Its totient is φ = 85859590.

The previous prime is 85859569. The next prime is 85859593. The reversal of 85859591 is 19595858.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85859591 is a prime.

Together with 85859593, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85859593) 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, 42929795 + 42929796.

It is an arithmetic number, because the mean of its divisors is an integer number (42929796).

Almost surely, 2^85859591 is an apocalyptic number.

85859591 is a deficient number, since it is larger than the sum of its proper divisors (1).

85859591 is an equidigital number, since it uses as much as digits as its factorization.

85859591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648000, while the sum is 50.

The square root of 85859591 is about 9266.0450570888. The cubic root of 85859591 is about 441.1601460044.

The spelling of 85859591 in words is "eighty-five million, eight hundred fifty-nine thousand, five hundred ninety-one".