85601779 has 2 divisors, whose sum is σ = 85601780. Its totient is φ = 85601778.

The previous prime is 85601767. The next prime is 85601797. The reversal of 85601779 is 97710658.

Together with next prime (85601797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85601779 - 2⁷ = 85601651 is a prime.

It is not a weakly prime, because it can be changed into another prime (85601759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42800889 + 42800890.

It is an arithmetic number, because the mean of its divisors is an integer number (42800890).

Almost surely, 2^85601779 is an apocalyptic number.

85601779 is a deficient number, since it is larger than the sum of its proper divisors (1).

85601779 is an equidigital number, since it uses as much as digits as its factorization.

85601779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 43.

The square root of 85601779 is about 9252.1229455731. The cubic root of 85601779 is about 440.7181437079.

The spelling of 85601779 in words is "eighty-five million, six hundred one thousand, seven hundred seventy-nine".