85850813 has 2 divisors, whose sum is σ = 85850814. Its totient is φ = 85850812.

The previous prime is 85850803. The next prime is 85850819. The reversal of 85850813 is 31805858.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76772644 + 9078169 = 8762^2 + 3013^2 .

It is a cyclic number.

It is not a de Polignac number, because 85850813 - 2¹⁰ = 85849789 is a prime.

It is a super-3 number, since 3×85850813³ (a number of 25 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85850819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42925406 + 42925407.

It is an arithmetic number, because the mean of its divisors is an integer number (42925407).

Almost surely, 2^85850813 is an apocalyptic number.

It is an amenable number.

85850813 is a deficient number, since it is larger than the sum of its proper divisors (1).

85850813 is an equidigital number, since it uses as much as digits as its factorization.

85850813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38400, while the sum is 38.

The square root of 85850813 is about 9265.5713801147. The cubic root of 85850813 is about 441.1451112417.

The spelling of 85850813 in words is "eighty-five million, eight hundred fifty thousand, eight hundred thirteen".