85821677 has 2 divisors, whose sum is σ = 85821678. Its totient is φ = 85821676.

The previous prime is 85821607. The next prime is 85821691. The reversal of 85821677 is 77612858.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58583716 + 27237961 = 7654^2 + 5219^2 .

It is a cyclic number.

It is not a de Polignac number, because 85821677 - 2¹⁶ = 85756141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85821607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42910838 + 42910839.

It is an arithmetic number, because the mean of its divisors is an integer number (42910839).

Almost surely, 2^85821677 is an apocalyptic number.

It is an amenable number.

85821677 is a deficient number, since it is larger than the sum of its proper divisors (1).

85821677 is an equidigital number, since it uses as much as digits as its factorization.

85821677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 188160, while the sum is 44.

The square root of 85821677 is about 9263.9989745250. The cubic root of 85821677 is about 441.0952004028.

The spelling of 85821677 in words is "eighty-five million, eight hundred twenty-one thousand, six hundred seventy-seven".