85581011 has 2 divisors, whose sum is σ = 85581012. Its totient is φ = 85581010.

The previous prime is 85581007. The next prime is 85581017. The reversal of 85581011 is 11018558.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85581011 - 2² = 85581007 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (85581017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42790505 + 42790506.

It is an arithmetic number, because the mean of its divisors is an integer number (42790506).

Almost surely, 2^85581011 is an apocalyptic number.

85581011 is a deficient number, since it is larger than the sum of its proper divisors (1).

85581011 is an equidigital number, since it uses as much as digits as its factorization.

85581011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1600, while the sum is 29.

The square root of 85581011 is about 9251.0005404821. Note that the first 3 decimals coincide. The cubic root of 85581011 is about 440.6824996873.

Adding to 85581011 its reverse (11018558), we get a palindrome (96599569).

The spelling of 85581011 in words is "eighty-five million, five hundred eighty-one thousand, eleven".