85805143 has 2 divisors, whose sum is σ = 85805144. Its totient is φ = 85805142.

The previous prime is 85805089. The next prime is 85805177. The reversal of 85805143 is 34150858.

It is an a-pointer prime, because the next prime (85805177) can be obtained adding 85805143 to its sum of digits (34).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85805143 - 2²⁵ = 52250711 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 85805099 and 85805108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85805543) 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, 42902571 + 42902572.

It is an arithmetic number, because the mean of its divisors is an integer number (42902572).

Almost surely, 2^85805143 is an apocalyptic number.

85805143 is a deficient number, since it is larger than the sum of its proper divisors (1).

85805143 is an equidigital number, since it uses as much as digits as its factorization.

85805143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 85805143 is about 9263.1065523398. The cubic root of 85805143 is about 441.0668721424.

The spelling of 85805143 in words is "eighty-five million, eight hundred five thousand, one hundred forty-three".