985181 has 2 divisors, whose sum is σ = 985182. Its totient is φ = 985180.

The previous prime is 985177. The next prime is 985213. The reversal of 985181 is 181589.

It is a happy number.

985181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (985213) can be obtained adding 985181 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 749956 + 235225 = 866^2 + 485^2 .

It is a cyclic number.

It is not a de Polignac number, because 985181 - 2² = 985177 is a prime.

It is a super-2 number, since 2×985181² = 1941163205522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (985121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492590 + 492591.

It is an arithmetic number, because the mean of its divisors is an integer number (492591).

2⁹⁸⁵¹⁸¹ is an apocalyptic number.

It is an amenable number.

985181 is a deficient number, since it is larger than the sum of its proper divisors (1).

985181 is an equidigital number, since it uses as much as digits as its factorization.

985181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 32.

The square root of 985181 is about 992.5628443580. The cubic root of 985181 is about 99.5035730138.

The spelling of 985181 in words is "nine hundred eighty-five thousand, one hundred eighty-one".