85934781 has 6 divisors (see below), whose sum is σ = 124128030. Its totient is φ = 57289848.

The previous prime is 85934773. The next prime is 85934789. The reversal of 85934781 is 18743958.

It is an interprime number because it is at equal distance from previous prime (85934773) and next prime (85934789).

It can be written as a sum of positive squares in only one way, i.e., 78481881 + 7452900 = 8859^2 + 2730^2 .

It is not a de Polignac number, because 85934781 - 2³ = 85934773 is a prime.

It is a super-2 number, since 2×85934781² = 14769573171035922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85934789) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4774146 + ... + 4774163.

It is an arithmetic number, because the mean of its divisors is an integer number (20688005).

Almost surely, 2^85934781 is an apocalyptic number.

It is an amenable number.

85934781 is a deficient number, since it is larger than the sum of its proper divisors (38193249).

85934781 is a wasteful number, since it uses less digits than its factorization.

85934781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9548315 (or 9548312 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 85934781 is about 9270.1014557555. The cubic root of 85934781 is about 441.2888877978.

The spelling of 85934781 in words is "eighty-five million, nine hundred thirty-four thousand, seven hundred eighty-one".