85185643 has 2 divisors, whose sum is σ = 85185644. Its totient is φ = 85185642.

The previous prime is 85185601. The next prime is 85185679. The reversal of 85185643 is 34658158.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85185643 - 2²¹ = 83088491 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 85185596 and 85185605.

It is not a weakly prime, because it can be changed into another prime (85185143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42592821 + 42592822.

It is an arithmetic number, because the mean of its divisors is an integer number (42592822).

Almost surely, 2^85185643 is an apocalyptic number.

85185643 is a deficient number, since it is larger than the sum of its proper divisors (1).

85185643 is an equidigital number, since it uses as much as digits as its factorization.

85185643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 115200, while the sum is 40.

The square root of 85185643 is about 9229.6068713678. The cubic root of 85185643 is about 440.0028288386.

It can be divided in two parts, 8518 and 5643, that added together give a square (14161 = 119²).

The spelling of 85185643 in words is "eighty-five million, one hundred eighty-five thousand, six hundred forty-three".