85811777 has 2 divisors, whose sum is σ = 85811778. Its totient is φ = 85811776.

The previous prime is 85811749. The next prime is 85811849. The reversal of 85811777 is 77711858.

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., 62473216 + 23338561 = 7904^2 + 4831^2 .

It is a cyclic number.

It is not a de Polignac number, because 85811777 - 2⁸ = 85811521 is a prime.

It is a super-2 number, since 2×85811777² = 14727322143795458, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85811477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42905888 + 42905889.

It is an arithmetic number, because the mean of its divisors is an integer number (42905889).

Almost surely, 2^85811777 is an apocalyptic number.

It is an amenable number.

85811777 is a deficient number, since it is larger than the sum of its proper divisors (1).

85811777 is an equidigital number, since it uses as much as digits as its factorization.

85811777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 109760, while the sum is 44.

The square root of 85811777 is about 9263.4646326307. The cubic root of 85811777 is about 441.0782388357.

The spelling of 85811777 in words is "eighty-five million, eight hundred eleven thousand, seven hundred seventy-seven".