85266191 has 2 divisors, whose sum is σ = 85266192. Its totient is φ = 85266190.

The previous prime is 85266187. The next prime is 85266193. The reversal of 85266191 is 19166258.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85266191 - 2² = 85266187 is a prime.

Together with 85266193, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_4958255 and since 85266191 and 4958255 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85266193) 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, 42633095 + 42633096.

It is an arithmetic number, because the mean of its divisors is an integer number (42633096).

Almost surely, 2^85266191 is an apocalyptic number.

85266191 is a deficient number, since it is larger than the sum of its proper divisors (1).

85266191 is an equidigital number, since it uses as much as digits as its factorization.

85266191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 38.

The square root of 85266191 is about 9233.9694064904. The cubic root of 85266191 is about 440.1414679404.

The spelling of 85266191 in words is "eighty-five million, two hundred sixty-six thousand, one hundred ninety-one".