85543993 has 2 divisors, whose sum is σ = 85543994. Its totient is φ = 85543992.

The previous prime is 85543981. The next prime is 85544047. The reversal of 85543993 is 39934558.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72641529 + 12902464 = 8523^2 + 3592^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85543993 is a prime.

It is not a weakly prime, because it can be changed into another prime (85543933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42771996 + 42771997.

It is an arithmetic number, because the mean of its divisors is an integer number (42771997).

Almost surely, 2^85543993 is an apocalyptic number.

It is an amenable number.

85543993 is a deficient number, since it is larger than the sum of its proper divisors (1).

85543993 is an equidigital number, since it uses as much as digits as its factorization.

85543993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 583200, while the sum is 46.

The square root of 85543993 is about 9248.9995675208. Note that the first 3 decimals coincide. The cubic root of 85543993 is about 440.6189515660.

The spelling of 85543993 in words is "eighty-five million, five hundred forty-three thousand, nine hundred ninety-three".