85023181 has 2 divisors, whose sum is σ = 85023182. Its totient is φ = 85023180.

The previous prime is 85023167. The next prime is 85023199. The reversal of 85023181 is 18132058.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59923081 + 25100100 = 7741^2 + 5010^2 .

It is a cyclic number.

It is not a de Polignac number, because 85023181 - 2⁵ = 85023149 is a prime.

It is a super-2 number, since 2×85023181² = 14457882614717522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85023781) 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 as a sum of consecutive naturals, namely, 42511590 + 42511591.

It is an arithmetic number, because the mean of its divisors is an integer number (42511591).

Almost surely, 2^85023181 is an apocalyptic number.

It is an amenable number.

85023181 is a deficient number, since it is larger than the sum of its proper divisors (1).

85023181 is an equidigital number, since it uses as much as digits as its factorization.

85023181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 85023181 is about 9220.8015378274. The cubic root of 85023181 is about 439.7229333510.

The spelling of 85023181 in words is "eighty-five million, twenty-three thousand, one hundred eighty-one".