85120811 has 2 divisors, whose sum is σ = 85120812. Its totient is φ = 85120810.

The previous prime is 85120799. The next prime is 85120837. The reversal of 85120811 is 11802158.

It is an a-pointer prime, because the next prime (85120837) can be obtained adding 85120811 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85120811 - 2¹⁰ = 85119787 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85128811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42560405 + 42560406.

It is an arithmetic number, because the mean of its divisors is an integer number (42560406).

Almost surely, 2^85120811 is an apocalyptic number.

85120811 is a deficient number, since it is larger than the sum of its proper divisors (1).

85120811 is an equidigital number, since it uses as much as digits as its factorization.

85120811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 26.

The square root of 85120811 is about 9226.0940272685. The cubic root of 85120811 is about 439.8911765998.

Adding to 85120811 its reverse (11802158), we get a palindrome (96922969).

The spelling of 85120811 in words is "eighty-five million, one hundred twenty thousand, eight hundred eleven".