85281577 has 2 divisors, whose sum is σ = 85281578. Its totient is φ = 85281576.

The previous prime is 85281569. The next prime is 85281583. The reversal of 85281577 is 77518258.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84934656 + 346921 = 9216^2 + 589^2 .

It is a cyclic number.

It is not a de Polignac number, because 85281577 - 2³ = 85281569 is a prime.

It is not a weakly prime, because it can be changed into another prime (85281277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42640788 + 42640789.

It is an arithmetic number, because the mean of its divisors is an integer number (42640789).

Almost surely, 2^85281577 is an apocalyptic number.

It is an amenable number.

85281577 is a deficient number, since it is larger than the sum of its proper divisors (1).

85281577 is an equidigital number, since it uses as much as digits as its factorization.

85281577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 156800, while the sum is 43.

The square root of 85281577 is about 9234.8024884131. The cubic root of 85281577 is about 440.1679403685.

It can be divided in two parts, 85281 and 577, that added together give a palindrome (85858).

The spelling of 85281577 in words is "eighty-five million, two hundred eighty-one thousand, five hundred seventy-seven".