85571081 has 4 divisors (see below), whose sum is σ = 90604692. Its totient is φ = 80537472.

The previous prime is 85571071. The next prime is 85571107. The reversal of 85571081 is 18017558.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 59151481 + 26419600 = 7691^2 + 5140^2 .

It is a cyclic number.

It is not a de Polignac number, because 85571081 - 2¹⁴ = 85554697 is a prime.

It is a super-2 number, since 2×85571081² = 14644819807017122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85571011) 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, 2516780 + ... + 2516813.

It is an arithmetic number, because the mean of its divisors is an integer number (22651173).

Almost surely, 2^85571081 is an apocalyptic number.

It is an amenable number.

85571081 is a deficient number, since it is larger than the sum of its proper divisors (5033611).

85571081 is a wasteful number, since it uses less digits than its factorization.

85571081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5033610.

The product of its (nonzero) digits is 11200, while the sum is 35.

The square root of 85571081 is about 9250.4638262089. The cubic root of 85571081 is about 440.6654548373.

The spelling of 85571081 in words is "eighty-five million, five hundred seventy-one thousand, eighty-one".