85801577 has 4 divisors (see below), whose sum is σ = 86237316. Its totient is φ = 85365840.

The previous prime is 85801531. The next prime is 85801579. The reversal of 85801577 is 77510858.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77510858 = 2 ⋅38755429.

It can be written as a sum of positive squares in 2 ways, for example, as 79370281 + 6431296 = 8909^2 + 2536^2 .

It is a cyclic number.

It is not a de Polignac number, because 85801577 - 2¹⁰ = 85800553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85801579) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217574 + ... + 217967.

It is an arithmetic number, because the mean of its divisors is an integer number (21559329).

Almost surely, 2^85801577 is an apocalyptic number.

It is an amenable number.

85801577 is a deficient number, since it is larger than the sum of its proper divisors (435739).

85801577 is a wasteful number, since it uses less digits than its factorization.

85801577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435738.

The product of its (nonzero) digits is 78400, while the sum is 41.

The square root of 85801577 is about 9262.9140663184. The cubic root of 85801577 is about 441.0607619172.

The spelling of 85801577 in words is "eighty-five million, eight hundred one thousand, five hundred seventy-seven".