85811849 has 2 divisors, whose sum is σ = 85811850. Its totient is φ = 85811848.

The previous prime is 85811777. The next prime is 85811851. The reversal of 85811849 is 94811858.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50623225 + 35188624 = 7115^2 + 5932^2 .

It is a cyclic number.

It is not a de Polignac number, because 85811849 - 2¹² = 85807753 is a prime.

Together with 85811851, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85811749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42905924 + 42905925.

It is an arithmetic number, because the mean of its divisors is an integer number (42905925).

Almost surely, 2^85811849 is an apocalyptic number.

It is an amenable number.

85811849 is a deficient number, since it is larger than the sum of its proper divisors (1).

85811849 is an equidigital number, since it uses as much as digits as its factorization.

85811849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92160, while the sum is 44.

The square root of 85811849 is about 9263.4685188648. The cubic root of 85811849 is about 441.0783621973.

Subtracting 85811849 from its reverse (94811858), we obtain a palindrome (9000009).

The spelling of 85811849 in words is "eighty-five million, eight hundred eleven thousand, eight hundred forty-nine".