85310581 has 4 divisors (see below), whose sum is σ = 87294592. Its totient is φ = 83326572.

The previous prime is 85310557. The next prime is 85310587. The reversal of 85310581 is 18501358.

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 85310581 - 2⁷ = 85310453 is a prime.

It is a super-2 number, since 2×85310581² = 14555790461115122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85310587) 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, 991941 + ... + 992026.

It is an arithmetic number, because the mean of its divisors is an integer number (21823648).

Almost surely, 2^85310581 is an apocalyptic number.

It is an amenable number.

85310581 is a deficient number, since it is larger than the sum of its proper divisors (1984011).

85310581 is a wasteful number, since it uses less digits than its factorization.

85310581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1984010.

The product of its (nonzero) digits is 4800, while the sum is 31.

The square root of 85310581 is about 9236.3727187679. The cubic root of 85310581 is about 440.2178346300.

The spelling of 85310581 in words is "eighty-five million, three hundred ten thousand, five hundred eighty-one".