85111601 has 2 divisors, whose sum is σ = 85111602. Its totient is φ = 85111600.

The previous prime is 85111597. The next prime is 85111619. The reversal of 85111601 is 10611158.

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., 84621601 + 490000 = 9199^2 + 700^2 .

It is a cyclic number.

It is not a de Polignac number, because 85111601 - 2² = 85111597 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (85110601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42555800 + 42555801.

It is an arithmetic number, because the mean of its divisors is an integer number (42555801).

Almost surely, 2^85111601 is an apocalyptic number.

It is an amenable number.

85111601 is a deficient number, since it is larger than the sum of its proper divisors (1).

85111601 is an equidigital number, since it uses as much as digits as its factorization.

85111601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 23.

The square root of 85111601 is about 9225.5948859681. The cubic root of 85111601 is about 439.8753107427.

Adding to 85111601 its reverse (10611158), we get a palindrome (95722759).

The spelling of 85111601 in words is "eighty-five million, one hundred eleven thousand, six hundred one".