85775521 has 4 divisors (see below), whose sum is σ = 92373652. Its totient is φ = 79177392.

The previous prime is 85775483. The next prime is 85775539. The reversal of 85775521 is 12557758.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12557758 = 2 ⋅6278879.

It can be written as a sum of positive squares in 2 ways, for example, as 35521600 + 50253921 = 5960^2 + 7089^2 .

It is a cyclic number.

It is not a de Polignac number, because 85775521 - 2¹¹ = 85773473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85775551) 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, 3299046 + ... + 3299071.

It is an arithmetic number, because the mean of its divisors is an integer number (23093413).

Almost surely, 2^85775521 is an apocalyptic number.

It is an amenable number.

85775521 is a deficient number, since it is larger than the sum of its proper divisors (6598131).

85775521 is a wasteful number, since it uses less digits than its factorization.

85775521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6598130.

The product of its digits is 98000, while the sum is 40.

The square root of 85775521 is about 9261.5074906842. The cubic root of 85775521 is about 441.0161106682.

The spelling of 85775521 in words is "eighty-five million, seven hundred seventy-five thousand, five hundred twenty-one".