85851191 has 2 divisors, whose sum is σ = 85851192. Its totient is φ = 85851190.

The previous prime is 85851169. The next prime is 85851247. The reversal of 85851191 is 19115858.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85851191 - 2⁶ = 85851127 is a prime.

It is a super-2 number, since 2×85851191² = 14740853992236962, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85851131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42925595 + 42925596.

It is an arithmetic number, because the mean of its divisors is an integer number (42925596).

Almost surely, 2^85851191 is an apocalyptic number.

85851191 is a deficient number, since it is larger than the sum of its proper divisors (1).

85851191 is an equidigital number, since it uses as much as digits as its factorization.

85851191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 38.

The square root of 85851191 is about 9265.5917781866. The cubic root of 85851191 is about 441.1457586928.

It can be divided in two parts, 858 and 51191, that multiplied together give a triangular number (43921878 = T₉₃₇₂).

The spelling of 85851191 in words is "eighty-five million, eight hundred fifty-one thousand, one hundred ninety-one".