85946581 has 4 divisors (see below), whose sum is σ = 98224672. Its totient is φ = 73668492.

The previous prime is 85946533. The next prime is 85946587. The reversal of 85946581 is 18564958.

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 85946581 - 2⁷ = 85946453 is a prime.

It is a super-2 number, since 2×85946581² = 14773629571179122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85946587) 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, 6139035 + ... + 6139048.

It is an arithmetic number, because the mean of its divisors is an integer number (24556168).

Almost surely, 2^85946581 is an apocalyptic number.

It is an amenable number.

85946581 is a deficient number, since it is larger than the sum of its proper divisors (12278091).

85946581 is a wasteful number, since it uses less digits than its factorization.

85946581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12278090.

The product of its digits is 345600, while the sum is 46.

The square root of 85946581 is about 9270.7378886473. The cubic root of 85946581 is about 441.3090851711.

The spelling of 85946581 in words is "eighty-five million, nine hundred forty-six thousand, five hundred eighty-one".