85822581 has 16 divisors (see below), whose sum is σ = 124721856. Its totient is φ = 52175616.

The previous prime is 85822543. The next prime is 85822589. The reversal of 85822581 is 18522858.

It is not a de Polignac number, because 85822581 - 2¹¹ = 85820533 is a prime.

It is a super-2 number, since 2×85822581² = 14731030819003122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85822589) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10020 + ... + 16493.

It is an arithmetic number, because the mean of its divisors is an integer number (7795116).

Almost surely, 2^85822581 is an apocalyptic number.

It is an amenable number.

85822581 is a deficient number, since it is larger than the sum of its proper divisors (38899275).

85822581 is a wasteful number, since it uses less digits than its factorization.

85822581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26612.

The product of its digits is 51200, while the sum is 39.

The square root of 85822581 is about 9264.0477654209. The cubic root of 85822581 is about 441.0967491517.

The spelling of 85822581 in words is "eighty-five million, eight hundred twenty-two thousand, five hundred eighty-one".