85771657 has 2 divisors, whose sum is σ = 85771658. Its totient is φ = 85771656.

The previous prime is 85771639. The next prime is 85771729. The reversal of 85771657 is 75617758.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81378441 + 4393216 = 9021^2 + 2096^2 .

It is a cyclic number.

It is not a de Polignac number, because 85771657 - 2¹¹ = 85769609 is a prime.

It is not a weakly prime, because it can be changed into another prime (85771607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42885828 + 42885829.

It is an arithmetic number, because the mean of its divisors is an integer number (42885829).

Almost surely, 2^85771657 is an apocalyptic number.

It is an amenable number.

85771657 is a deficient number, since it is larger than the sum of its proper divisors (1).

85771657 is an equidigital number, since it uses as much as digits as its factorization.

85771657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 411600, while the sum is 46.

The square root of 85771657 is about 9261.2988829861. The cubic root of 85771657 is about 441.0094882977.

The spelling of 85771657 in words is "eighty-five million, seven hundred seventy-one thousand, six hundred fifty-seven".