85258581 has 4 divisors (see below), whose sum is σ = 113678112. Its totient is φ = 56839052.

The previous prime is 85258577. The next prime is 85258583. The reversal of 85258581 is 18585258.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 85258581 - 2² = 85258577 is a prime.

It is a super-2 number, since 2×85258581² = 14538051268267122, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85258583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14209761 + ... + 14209766.

It is an arithmetic number, because the mean of its divisors is an integer number (28419528).

Almost surely, 2^85258581 is an apocalyptic number.

It is an amenable number.

85258581 is a deficient number, since it is larger than the sum of its proper divisors (28419531).

85258581 is a wasteful number, since it uses less digits than its factorization.

85258581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28419530.

The product of its digits is 128000, while the sum is 42.

The square root of 85258581 is about 9233.5573318196. The cubic root of 85258581 is about 440.1283733551.

The spelling of 85258581 in words is "eighty-five million, two hundred fifty-eight thousand, five hundred eighty-one".