85163381 has 16 divisors (see below), whose sum is σ = 90046320. Its totient is φ = 80455680.

The previous prime is 85163371. The next prime is 85163383. The reversal of 85163381 is 18336158.

It can be written as a sum of positive squares in 8 ways, for example, as 4774225 + 80389156 = 2185^2 + 8966^2 .

It is a de Polignac number, because none of the positive numbers 2^k-85163381 is a prime.

It is a super-2 number, since 2×85163381² = 14505602926702322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85163383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 218735 + ... + 219123.

It is an arithmetic number, because the mean of its divisors is an integer number (5627895).

Almost surely, 2^85163381 is an apocalyptic number.

It is an amenable number.

85163381 is a deficient number, since it is larger than the sum of its proper divisors (4882939).

85163381 is a wasteful number, since it uses less digits than its factorization.

85163381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584.

The product of its digits is 17280, while the sum is 35.

The square root of 85163381 is about 9228.4007823674. The cubic root of 85163381 is about 439.9644961022.

The spelling of 85163381 in words is "eighty-five million, one hundred sixty-three thousand, three hundred eighty-one".