85105381 has 4 divisors (see below), whose sum is σ = 87181164. Its totient is φ = 83029600.

The previous prime is 85105369. The next prime is 85105399. The reversal of 85105381 is 18350158.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18350158 = 2 ⋅9175079.

It can be written as a sum of positive squares in 2 ways, for example, as 29528356 + 55577025 = 5434^2 + 7455^2 .

It is a cyclic number.

It is not a de Polignac number, because 85105381 - 2⁷ = 85105253 is a prime.

It is a super-2 number, since 2×85105381² = 14485851750310322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85105781) 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, 1037830 + ... + 1037911.

It is an arithmetic number, because the mean of its divisors is an integer number (21795291).

Almost surely, 2^85105381 is an apocalyptic number.

It is an amenable number.

85105381 is a deficient number, since it is larger than the sum of its proper divisors (2075783).

85105381 is a wasteful number, since it uses less digits than its factorization.

85105381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2075782.

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

The square root of 85105381 is about 9225.2577741763. The cubic root of 85105381 is about 439.8645950429.

The spelling of 85105381 in words is "eighty-five million, one hundred five thousand, three hundred eighty-one".